561:
282:
435:
300:
599:
312:
36:
419:
560:
153:
476:, but in actuality, the two are only coincidentally similar. Both formed at approximately the same time, and under similar conditions: to the north of the Acadian Mountains were the Caledonian Mountains, and a similar region of marsh and river delta formed there.
567:
780:
3065:
3060:
442:
During the
Devonian period, the Catskill Delta was formed by a series of river deltas and otherwise marshy terrain. This terrain was sandwiched between the epicontinental
3030:
773:
3070:
3055:
488:, the Catskill Mountains, unlike the Appalachian Mountains underwent glacial erosion. Much of what formed the Catskills as they stand today is a result of the
465:
were formed at a later date. This transformation and uncovering is the primary reason why the
Catskill Delta is notable in the present. Western Pennsylvania's
3035:
1875:
Gantz, Hundred-foot sand, Fifty-foot sand, Thirty-foot sand, Nineveh-Snee, Gordon Stray, Fourth Sand, Fifth Sand, Bayard Sand, Elizabeth Sand, Sweet
Richard,
1899:
Upper Warren, Lower Warren, Speechely Stray, Speechely, Balltown A, Balltown B, Balltown C, Sheffield, First
Bradford, Second Bradford, Third Bradford, Kane
766:
3050:
3045:
158:
690:
410:. Many beds are cyclical in nature, preserving the record of a dynamic environment during its approximately 20 million years of deposition.
119:
427:
546:
Towamensing, Walcksville, Beaverdam Run, Long Run, Packerton, Poplar Gap, Sawmill Run, Berry Run, Clarks Ferry, and
Duncannon.
53:
3040:
571:
100:
57:
1602:
1580:
72:
3075:
583:
954:
1229:
1219:
964:
939:
1289:
1279:
1156:
1145:
457:
Eventually, the Delta formation was buried and transformed into sandstone, which was then revealed in places when the
79:
1398:
1382:
1340:
1329:
2386:
2368:
2350:
1964:
1538:
1528:
191:
162:
46:
3080:
1445:
1352:
1304:
1294:
1224:
1088:
1428:
1284:
1166:
1161:
1109:
944:
367:. Minor marine layers exist in this thick rock unit (up to 10,000 feet (3,000 m)). It is equivalent to the
86:
1570:
1507:
1403:
1093:
1471:
1299:
1037:
2970:
1387:
1177:
1078:
1047:
1022:
217:
1497:
1433:
1098:
1083:
1027:
989:
199:
2757:
2208:
2157:
1439:
1423:
1274:
1171:
68:
2916:
2775:
2437:
2028:
1992:
1729:
1592:
1412:
1234:
1140:
901:
891:
886:
2033:
1997:
1878:
1842:
1689:
1622:
1392:
1376:
1269:
1115:
1062:
856:
2980:
2792:
2602:
2501:
2152:
1666:
1042:
1032:
715:
462:
403:
398:
of
Pennsylvania are largely underlain by this unit as well. The rocks of the Catskill are predominantly
269:
3010:
2867:
2213:
1940:
1543:
1533:
1482:
1454:
1244:
1239:
1135:
881:
871:
866:
2862:
2767:
2762:
2737:
2732:
2727:
1987:
1699:
1633:
1611:
1597:
911:
2975:
2872:
2818:
2704:
2340:
2220:
2047:
1837:
1725:
1586:
1476:
1324:
1182:
1125:
1072:
1012:
959:
929:
919:
634:
489:
213:
1888:
1150:
1103:
949:
861:
2699:
2666:
2645:
2249:
1969:
1864:
1857:
1704:
1684:
1649:
1334:
1209:
368:
209:
1465:
906:
896:
876:
2985:
2548:
2532:
2345:
2332:
2285:
2258:
2128:
2042:
1959:
1945:
1832:
1788:
1747:
1627:
1366:
1313:
1253:
789:
658:
650:
505:
458:
443:
391:
332:
187:
1906:
2965:
2948:
2931:
2921:
2851:
2806:
2784:
2746:
2597:
2400:
2070:
1765:
1673:
1056:
745:
708:"Hydrogeology, Aquifer Geochemistry, and Ground-Water Quality in Morgan County, West Virginia"
686:
579:
473:
451:
2940:
2830:
2691:
2621:
2576:
2461:
2395:
2203:
2198:
2123:
2065:
2054:
1847:
1694:
1564:
1517:
1491:
846:
642:
575:
530:
516:
395:
364:
317:
195:
177:
93:
2907:
2838:
2801:
2640:
2442:
2182:
2167:
2095:
1935:
1776:
1360:
1203:
728:
604:
485:
434:
407:
454:. Erosion brought sediment from the mountain westwards into the sea, forming the deltas.
638:
2585:
2336:
2315:
2301:
2238:
2187:
2090:
1954:
1815:
1264:
501:
387:
3024:
2716:
2629:
2429:
2137:
2108:
2104:
1852:
1781:
1771:
1006:
980:
840:
758:
662:
447:
376:
352:
287:
140:
598:
2655:
2565:
2521:
2490:
2473:
2450:
2133:
2079:
1754:
1658:
793:
360:
305:
166:
469:
was formed as a consequence. This was the first major oil region to be developed.
17:
3003:
2709:
1739:
801:
418:
356:
35:
2682:
2482:
2378:
1924:
1556:
1195:
832:
594:
525:
2897:
1824:
812:
587:
466:
438:
Point bar deposits in the
Catskill Formation (Devonian) near North Bend, PA.
399:
250:
240:
1717:
751:
2888:
2557:
2513:
2420:
2230:
2176:
2009:
1806:
998:
380:
372:
342:
144:
654:
2360:
823:
707:
157:
Outcrop of the Irish Valley Member of the
Catskill Formation along the
625:
Rich, John Lyon (1906). "Local
Glaciation in the Catskill Mountains".
554:
Irish Valley, Sherman Creek, Buddys Run, Clarks Ferry, and
Duncannon.
152:
2324:
710:. U.S. Geological Survey. Scientific Investigations Report 2006-5198.
423:
1917:
1st Elk Sand, 2nd Elk Sand, 3rd Elk Sand, 4th Elk Sand, 5th Elk Sand
646:
433:
417:
254:
685:. Flieschmanns, New York: Purple Mountain Press. pp. 14â29.
762:
570:
Geologic cross section of upper to middle Devonian strata from
29:
755:
Website summarize about Red Hill Shale in Catskill Formation
746:
Depositional environments in the Catskill Clastic Wedge
472:
The Catskill was once considered to be related to the
422:
Cut slab of the Catskill Formation from the Coleman
3002:
2939:
2930:
2896:
2887:
2829:
2783:
2690:
2681:
2620:
2556:
2547:
2512:
2481:
2472:
2428:
2419:
2377:
2359:
2323:
2314:
2229:
2175:
2166:
2008:
1823:
1814:
1805:
1738:
1716:
1657:
1648:
1555:
1351:
1194:
997:
988:
979:
831:
822:
811:
800:
484:Though both mountain ranges were formed during the
430:, Pennsylvania, showing mud clasts within sandstone
328:
323:
293:
275:
265:
260:
246:
236:
231:
223:
205:
183:
173:
134:
60:. Unsourced material may be challenged and removed.
394:of New York, from which its name is derived. The
386:The Catskill is the largest bedrock unit of the
774:
8:
706:Boughton, Carol J.; McCoy, Kurt J. (2006).
2936:
2893:
2687:
2553:
2478:
2425:
2320:
2172:
1820:
1811:
1654:
994:
985:
828:
819:
808:
781:
767:
759:
151:
131:
3066:Sandstone formations of the United States
3061:Devonian southern paleotemperate deposits
492:which ended only about 12,000 years ago.
120:Learn how and when to remove this message
3031:Geologic formations of New York (state)
617:
590:. The Catskill Formation is at the top.
426:of the Endless Mountain Stone Company,
402:, indicating a large-scale terrestrial
1603:Lower Connoquenessing Sandstone Member
1581:Upper Connoquenessing Sandstone Member
724:
713:
3071:Shale formations of the United States
7:
3056:Devonian geology of New York (state)
676:
674:
672:
58:adding citations to reliable sources
3036:Geologic formations of Pennsylvania
504:event which carved the current day
227:Up to 10,000 ft (3,000 m)
955:Middle Washington Limestone Member
390:in northeast Pennsylvania and the
27:Unit of sedimentary rock in the US
25:
1230:Lower Pittsburgh Limestone Member
1220:Upper Pittsburgh Limestone Member
965:Lower Washington Limestone Member
940:Upper Washington Limestone Member
3051:Devonian geology of Pennsylvania
3046:Devonian System of North America
1290:Lower Saltsburg Sandstone Member
1280:Upper Saltsburg Sandstone Member
1157:Lower Sewickley Sandstone Member
1146:Upper Sewickley Sandstone Member
597:
559:
355:is a unit of mostly terrestrial
310:
298:
280:
34:
1399:Upper Freeport Limestone Member
1383:Upper Freeport Limestone Member
1341:Lower Mahoning Sandstone Member
1330:Upper Mahoning Sandstone Member
45:needs additional citations for
1:
1539:Lower Mercer Limestone Member
1529:Upper Mercer Limestone Member
584:Ridge-and-Valley Appalachians
578:, south-southwest across the
515:Glacial Erratics such as the
683:The Catskills in the Ice Age
500:There are many signs of the
2296:Bobs Ridge Sandstone Member
1446:Kittanning Sandstone Member
1305:Bush Creek Limestone Member
1295:Pine Creek Limestone Member
1225:Little Pittsburgh coal seam
1153:"Meigis Creek" "No. 9 Coal"
1089:Waynesburg Limestone Member
3097:
2387:Helderberg Group (geology)
2369:Helderberg Group (geology)
2351:Helderberg Group (geology)
1965:Huntley Mountain Formation
1429:Johnstone Limestone Member
1285:Woods Run Limestone Member
1167:Cedarville Sanstone Member
1162:Sewickley Limestone Member
1110:Uniontown Limestone Member
945:Jollytown Limestone Member
192:Huntley Mountain Formation
1571:Connoquenessing Formation
1508:Homewood Sandstone Member
1404:Freeport Sandstone Member
1094:Uniontown Sanstone Member
150:
139:
1472:Vanport Limestone Member
1300:Buffalo Sandstone Member
1038:Middle Waynesburg Member
414:Depositional environment
2971:Pleasent Hill Formation
1388:Butler Sandstone Member
1178:Westone Sanstone Member
1079:Gilboy Sandstone Member
1048:Lower Waynesburg Member
1023:Upper Waynesburg Member
524:"Dance Floors" such as
511:These markers include:
218:Trimmers Rock Formation
2438:Bass Islands Formation
1498:Beaver River Formation
1434:Middle Kittanning Coal
1099:Annabelle Shale Member
1084:Little Waynesburg Coal
1028:Little Washington Coal
723:Cite journal requires
681:Titus, Robert (1996).
627:The Journal of Geology
439:
431:
200:Spechty Kopf Formation
3041:Devonian Pennsylvania
2793:Wells Creek Formation
2758:Linden Hall Formation
2603:Goat Island Formation
2209:Skaneateles Formation
2158:Murrysville Sandstone
1768:"Big Injun Sandstone"
1440:Lower Kittanning Coal
1424:Upper Kittanning Coal
1275:Upper Bakerstown coal
1172:Redstone-Pomeroy coal
916:Upper Washington Coal
463:Appalachian Mountains
450:and the now-vanished
437:
421:
270:Appalachian Mountains
3076:Siltstone formations
2976:Waynesboro Formation
2917:Gatesburgh Formation
2873:Stonehenge Formation
2819:Bellefonte Formation
2776:Loyalsburg Formation
2705:Reedsville Formation
2341:Bois Blanc Formation
2221:Mahantango Formation
2048:Lock Haven Formation
2029:Sherman Creek Member
1993:Sherman Creek Member
1838:Lock Haven Formation
1730:Loyalhanna Formation
1726:Greenbrier Limestone
1593:Quakertown Fire Clay
1413:Kittanning Formation
1235:Connellsville Member
1183:Pittsburgh coal seam
1141:Upper Sewickley Coal
1126:Pittsburgh Formation
1013:Waynesburg Formation
930:Washington Formation
902:Prosperity Limestone
892:Claysville Limestone
887:Fish Creek Sandstone
550:Central Pennsylvania
542:Eastern Pennsylvania
490:Wisconsin glaciation
214:Lock Haven Formation
54:improve this article
2700:Queenston Formation
2667:Tuscarora Formation
2646:Rose Hill Formation
2250:Marcellus Formation
2034:Irish Valley Member
1998:Irish Valley Member
1970:Hampshire Formation
1879:Chadakoin Formation
1858:Cussewago Formation
1843:Riceville Formation
1705:Bluefield Formation
1690:Princeton Formation
1685:Bluestone Formation
1623:Sharon Shale Member
1393:Lower Freeport Coal
1377:Upper Freeport Coal
1270:Pittsburgh Red Beds
1210:Casselman Formation
1116:Fulton Shale Member
1063:Uniontown Formation
857:Windy Gap Limestone
639:1906JG.....14..113R
582:and then along the
496:Signs of Glaciation
369:Hampshire Formation
210:Foreknobs Formation
141:Stratigraphic range
2986:Antietam Formation
2981:Tomstown Formation
2533:Syracuse Formation
2502:Camillus Formation
2346:Oriskany Formation
2333:Huntersville Chert
2286:Huntersville Chert
2259:Onondaga Limestone
2153:Knapp Conglomerate
2129:Penn Yan Formation
2043:Brallier Formation
1960:Rockwell Formation
1833:Brallier Formation
1789:Rockwell Formation
1748:Cuyahoga Formation
1667:Shenango Formation
1367:Freeport Formation
1314:Mahoning Formation
1254:Glenshaw Formation
1043:WaynesburgâAâ coal
1033:WaynesburgâBâ coal
790:Chronostratigraphy
506:Catskill Mountains
440:
432:
428:Susquehanna County
333:Catskill Mountains
188:Rockwell Formation
18:Catskill Formation
3018:
3017:
3011:Grenville Complex
2998:
2997:
2994:
2993:
2966:Potsdam Formation
2961:
2960:
2957:
2956:
2949:Kinzers Formation
2922:Warrior Formation
2883:
2882:
2868:Nittany Formation
2852:Beekmantown Group
2807:Beekmantown Group
2747:Black River Group
2677:
2676:
2616:
2615:
2607:Gasport Formation
2598:Eramosa Formation
2543:
2542:
2415:
2414:
2411:
2410:
2401:Manlius Limestone
2310:
2309:
2214:Tichnor Formation
2148:
2147:
2071:Rhinestreet Shale
1941:Chagrin Formation
1801:
1800:
1797:
1796:
1766:Burgoon Formation
1674:Mauch Chunk Group
1644:
1643:
1544:Lower Mercer Coal
1534:Upper Mercer Coal
1483:Brookville Member
1455:Clarian Formation
1245:Birmingham Member
1240:Morgantown Member
1136:Benwood Limestone
1057:Monongahela Group
975:
974:
882:Nineveh Limestone
872:Nineveh Sandstone
867:Gilmore Sandstone
692:978-0-935796-77-3
580:Allegheny Plateau
531:Terminal moraines
474:Old Red Sandstone
452:Acadian Mountains
339:
338:
130:
129:
122:
104:
16:(Redirected from
3088:
3081:Deltaic deposits
2937:
2894:
2863:Axeman Formation
2768:Hatter Formation
2763:Snyder Formation
2738:Rodman Formation
2733:Salona Formation
2728:Coburn Formation
2688:
2594:Guelph Formation
2577:Vernon Formation
2554:
2479:
2462:Bertie Formation
2426:
2396:Keyser Formation
2321:
2204:Ludlow Formation
2199:Moscow Formation
2173:
2124:West River Shale
2066:Angola Formation
2055:West Falls Group
1988:Duncannon Member
1848:Oswayo Formation
1821:
1812:
1700:Maxton Sandstone
1695:Hinton Formation
1655:
1634:Sharon Sandstone
1612:Sharon Formation
1598:Quakertown Shale
1565:Pottsville Group
1518:Mercer Formation
1492:Pottsville Group
995:
986:
912:Donley Limestone
847:Greene Formation
829:
820:
815:
809:
804:
783:
776:
769:
760:
733:
732:
726:
721:
719:
711:
703:
697:
696:
678:
667:
666:
622:
607:
602:
601:
563:
517:Devils Tombstone
396:Pocono Mountains
318:New York (state)
316:
314:
313:
304:
302:
301:
286:
284:
283:
196:Pocono Formation
155:
132:
125:
118:
114:
111:
105:
103:
69:"Catskill Group"
62:
38:
30:
21:
3096:
3095:
3091:
3090:
3089:
3087:
3086:
3085:
3021:
3020:
3019:
3014:
2990:
2953:
2926:
2908:Knox Supergroup
2879:
2839:Knox Supergroup
2825:
2802:Knox Supergroup
2779:
2673:
2641:Rochester Shale
2612:
2539:
2508:
2468:
2445:
2443:Akron Formation
2407:
2373:
2355:
2306:
2225:
2183:Tully Limestone
2162:
2144:
2096:Middlesex Shale
2004:
1936:Cleveland Shale
1793:
1777:Berea Sandstone
1734:
1712:
1640:
1587:Quakertown Coal
1583:"2nd Salt Sand"
1569:
1551:
1510:"1st Salt Sand"
1496:
1477:Brookville Coal
1365:
1361:Allegheny Group
1347:
1325:Bush Creek Coal
1208:
1204:Conemaugh Group
1190:
1124:
1073:Waynesburg coal
1061:
1011:
971:
960:Washington Coal
928:
920:Rockport Member
845:
813:
802:
796:
787:
742:
737:
736:
722:
712:
705:
704:
700:
693:
680:
679:
670:
624:
623:
619:
614:
605:Devonian portal
603:
596:
593:
592:
591:
569:
564:
552:
544:
539:
498:
486:Acadian orogeny
482:
480:Glacial Erosion
416:
408:Acadian orogeny
392:Catskill region
311:
309:
299:
297:
281:
279:
169:
159:Horseshoe Curve
126:
115:
109:
106:
63:
61:
51:
39:
28:
23:
22:
15:
12:
11:
5:
3094:
3092:
3084:
3083:
3078:
3073:
3068:
3063:
3058:
3053:
3048:
3043:
3038:
3033:
3023:
3022:
3016:
3015:
3013:
3008:
3006:
3000:
2999:
2996:
2995:
2992:
2991:
2989:
2988:
2983:
2978:
2973:
2968:
2962:
2959:
2958:
2955:
2954:
2952:
2951:
2945:
2943:
2934:
2928:
2927:
2925:
2924:
2919:
2913:
2912:
2911:
2910:
2902:
2900:
2891:
2885:
2884:
2881:
2880:
2878:
2877:
2876:
2875:
2870:
2865:
2857:
2856:
2854:
2848:
2847:
2846:
2845:
2841:
2835:
2833:
2827:
2826:
2824:
2823:
2822:
2821:
2813:
2812:
2811:
2810:
2804:
2796:
2795:
2789:
2787:
2781:
2780:
2773:
2772:
2771:
2770:
2765:
2760:
2752:
2751:
2749:
2743:
2742:
2741:
2740:
2735:
2730:
2722:
2721:
2719:
2713:
2712:
2707:
2702:
2696:
2694:
2685:
2679:
2678:
2675:
2674:
2672:
2671:
2670:
2669:
2661:
2660:
2658:
2652:
2651:
2650:
2649:
2643:
2635:
2634:
2632:
2626:
2624:
2618:
2617:
2614:
2613:
2611:
2610:
2609:
2608:
2605:
2600:
2595:
2589:
2588:
2586:Lockport Group
2582:
2581:
2580:
2579:
2571:
2570:
2568:
2562:
2560:
2551:
2545:
2544:
2541:
2540:
2538:
2537:
2536:
2535:
2527:
2526:
2524:
2518:
2516:
2510:
2509:
2507:
2506:
2505:
2504:
2496:
2495:
2493:
2487:
2485:
2476:
2470:
2469:
2467:
2466:
2465:
2464:
2456:
2455:
2453:
2447:
2446:
2440:
2434:
2432:
2423:
2417:
2416:
2413:
2412:
2409:
2408:
2406:
2405:
2404:
2403:
2398:
2390:
2389:
2383:
2381:
2375:
2374:
2372:
2371:
2365:
2363:
2357:
2356:
2354:
2353:
2348:
2343:
2337:Needmore Shale
2329:
2327:
2318:
2312:
2311:
2308:
2307:
2305:
2304:
2302:Needmore Shale
2299:
2298:
2297:
2291:
2290:
2289:
2288:
2280:
2279:
2278:
2277:
2274:
2271:
2268:
2262:
2261:
2255:
2254:
2253:
2252:
2244:
2243:
2241:
2239:Hamilton Group
2235:
2233:
2227:
2226:
2224:
2223:
2218:
2217:
2216:
2211:
2206:
2201:
2193:
2192:
2190:
2188:Hamilton Group
2181:
2179:
2170:
2164:
2163:
2161:
2160:
2155:
2149:
2146:
2145:
2143:
2142:
2141:
2140:
2131:
2126:
2118:
2117:
2116:
2115:
2111:
2101:
2100:
2099:
2098:
2093:
2091:Cashaqua Shale
2085:
2084:
2082:
2076:
2075:
2074:
2073:
2068:
2060:
2059:
2057:
2051:
2050:
2045:
2039:
2038:
2037:
2036:
2031:
2023:
2022:
2020:
2018:Catskill Group
2014:
2012:
2006:
2005:
2003:
2002:
2001:
2000:
1995:
1990:
1982:
1981:
1979:
1977:Catskill Group
1973:
1972:
1967:
1962:
1957:
1955:Java Formation
1951:
1950:
1949:
1948:
1943:
1938:
1930:
1929:
1927:
1921:
1920:
1919:
1918:
1912:
1911:
1909:
1903:
1902:
1901:
1900:
1894:
1893:
1891:
1889:Bradford Group
1885:
1884:
1883:
1882:
1881:, First Warren
1876:
1870:
1869:
1867:
1861:
1860:
1855:
1850:
1845:
1840:
1835:
1829:
1827:
1818:
1809:
1803:
1802:
1799:
1798:
1795:
1794:
1792:
1791:
1786:
1785:
1784:
1779:
1774:
1769:
1760:
1759:
1757:
1751:
1750:
1744:
1742:
1736:
1735:
1733:
1732:
1722:
1720:
1714:
1713:
1711:
1710:
1709:
1708:
1702:
1697:
1692:
1687:
1679:
1678:
1676:
1670:
1669:
1663:
1661:
1652:
1646:
1645:
1642:
1641:
1639:
1638:
1637:
1636:
1631:
1625:
1617:
1616:
1614:
1608:
1607:
1606:
1605:
1600:
1595:
1590:
1584:
1575:
1574:
1567:
1561:
1559:
1553:
1552:
1550:
1549:
1548:
1547:
1541:
1536:
1531:
1523:
1522:
1520:
1514:
1513:
1512:
1511:
1502:
1501:
1494:
1488:
1487:
1486:
1485:
1480:
1474:
1469:
1460:
1459:
1457:
1451:
1450:
1449:
1448:
1443:
1437:
1431:
1426:
1418:
1417:
1415:
1409:
1408:
1407:
1406:
1401:
1396:
1390:
1385:
1380:
1371:
1370:
1363:
1357:
1355:
1349:
1348:
1346:
1345:
1344:
1343:
1338:
1332:
1327:
1319:
1318:
1316:
1310:
1309:
1308:
1307:
1302:
1297:
1292:
1287:
1282:
1277:
1272:
1267:
1265:Ames Limestone
1259:
1258:
1256:
1250:
1249:
1248:
1247:
1242:
1237:
1232:
1227:
1222:
1214:
1213:
1206:
1200:
1198:
1192:
1191:
1189:
1188:
1187:
1186:
1180:
1175:
1169:
1164:
1159:
1154:
1151:Sewickley Coal
1148:
1143:
1138:
1130:
1129:
1121:
1120:
1119:
1118:
1113:
1107:
1104:Uniontown Coal
1101:
1096:
1091:
1086:
1081:
1076:
1067:
1066:
1059:
1053:
1052:
1051:
1050:
1045:
1040:
1035:
1030:
1025:
1017:
1016:
1009:
1003:
1001:
992:
983:
977:
976:
973:
972:
970:
969:
968:
967:
962:
957:
952:
950:Jollytown Coal
947:
942:
934:
933:
925:
924:
923:
922:
917:
914:
909:
904:
899:
894:
889:
884:
879:
874:
869:
864:
862:Windy Gap Coal
859:
851:
850:
843:
837:
835:
826:
817:
806:
798:
797:
788:
786:
785:
778:
771:
763:
757:
756:
752:Devonian Times
748:
741:
740:External links
738:
735:
734:
725:|journal=
698:
691:
668:
647:10.1086/621285
633:(2): 113â121.
616:
615:
613:
610:
609:
608:
566:
565:
558:
557:
556:
551:
548:
543:
540:
538:
535:
534:
533:
528:
522:
519:
502:Glacial period
497:
494:
481:
478:
415:
412:
388:Upper Devonian
359:rock found in
346:Catskill Group
337:
336:
330:
326:
325:
321:
320:
295:
291:
290:
277:
273:
272:
267:
263:
262:
258:
257:
248:
244:
243:
238:
234:
233:
229:
228:
225:
221:
220:
207:
203:
202:
185:
181:
180:
175:
171:
170:
156:
148:
147:
137:
136:
135:Catskill Group
128:
127:
42:
40:
33:
26:
24:
14:
13:
10:
9:
6:
4:
3:
2:
3093:
3082:
3079:
3077:
3074:
3072:
3069:
3067:
3064:
3062:
3059:
3057:
3054:
3052:
3049:
3047:
3044:
3042:
3039:
3037:
3034:
3032:
3029:
3028:
3026:
3012:
3009:
3007:
3005:
3001:
2987:
2984:
2982:
2979:
2977:
2974:
2972:
2969:
2967:
2964:
2963:
2950:
2947:
2946:
2944:
2942:
2938:
2935:
2933:
2929:
2923:
2920:
2918:
2915:
2914:
2909:
2906:
2905:
2904:
2903:
2901:
2899:
2895:
2892:
2890:
2886:
2874:
2871:
2869:
2866:
2864:
2861:
2860:
2859:
2858:
2855:
2853:
2850:
2849:
2844:
2843:
2842:
2840:
2837:
2836:
2834:
2832:
2828:
2820:
2817:
2816:
2815:
2814:
2808:
2805:
2803:
2800:
2799:
2798:
2797:
2794:
2791:
2790:
2788:
2786:
2782:
2778:
2777:
2769:
2766:
2764:
2761:
2759:
2756:
2755:
2754:
2753:
2750:
2748:
2745:
2744:
2739:
2736:
2734:
2731:
2729:
2726:
2725:
2724:
2723:
2720:
2718:
2717:Trenton Group
2715:
2714:
2711:
2708:
2706:
2703:
2701:
2698:
2697:
2695:
2693:
2689:
2686:
2684:
2680:
2668:
2665:
2664:
2663:
2662:
2659:
2657:
2654:
2653:
2648:"Red Clinton"
2647:
2644:
2642:
2639:
2638:
2637:
2636:
2633:
2631:
2630:Clinton Group
2628:
2627:
2625:
2623:
2619:
2606:
2604:
2601:
2599:
2596:
2593:
2592:
2591:
2590:
2587:
2584:
2583:
2578:
2575:
2574:
2573:
2572:
2569:
2567:
2564:
2563:
2561:
2559:
2555:
2552:
2550:
2546:
2534:
2531:
2530:
2529:
2528:
2525:
2523:
2520:
2519:
2517:
2515:
2511:
2503:
2500:
2499:
2498:
2497:
2494:
2492:
2489:
2488:
2486:
2484:
2480:
2477:
2475:
2471:
2463:
2460:
2459:
2458:
2457:
2454:
2452:
2449:
2448:
2444:
2441:
2439:
2436:
2435:
2433:
2431:
2427:
2424:
2422:
2418:
2402:
2399:
2397:
2394:
2393:
2392:
2391:
2388:
2385:
2384:
2382:
2380:
2376:
2370:
2367:
2366:
2364:
2362:
2358:
2352:
2349:
2347:
2344:
2342:
2338:
2334:
2331:
2330:
2328:
2326:
2322:
2319:
2317:
2313:
2303:
2300:
2295:
2294:
2293:
2292:
2287:
2284:
2283:
2282:
2281:
2275:
2272:
2269:
2266:
2265:
2264:
2263:
2260:
2257:
2256:
2251:
2248:
2247:
2246:
2245:
2242:
2240:
2237:
2236:
2234:
2232:
2228:
2222:
2219:
2215:
2212:
2210:
2207:
2205:
2202:
2200:
2197:
2196:
2195:
2194:
2191:
2189:
2186:
2185:
2184:
2180:
2178:
2174:
2171:
2169:
2165:
2159:
2156:
2154:
2151:
2150:
2139:
2138:Geneseo Shale
2135:
2132:
2130:
2127:
2125:
2122:
2121:
2120:
2119:
2114:
2113:
2112:
2110:
2109:Harrell Shale
2106:
2105:Genesee Group
2103:
2102:
2097:
2094:
2092:
2089:
2088:
2087:
2086:
2083:
2081:
2078:
2077:
2072:
2069:
2067:
2064:
2063:
2062:
2061:
2058:
2056:
2053:
2052:
2049:
2046:
2044:
2041:
2040:
2035:
2032:
2030:
2027:
2026:
2025:
2024:
2021:
2019:
2016:
2015:
2013:
2011:
2007:
1999:
1996:
1994:
1991:
1989:
1986:
1985:
1984:
1983:
1980:
1978:
1975:
1974:
1971:
1968:
1966:
1963:
1961:
1958:
1956:
1953:
1952:
1947:
1944:
1942:
1939:
1937:
1934:
1933:
1932:
1931:
1928:
1926:
1923:
1922:
1916:
1915:
1914:
1913:
1910:
1908:
1905:
1904:
1898:
1897:
1896:
1895:
1892:
1890:
1887:
1886:
1880:
1877:
1874:
1873:
1872:
1871:
1868:
1866:
1865:Venango Group
1863:
1862:
1859:
1856:
1854:
1853:Bedford Shale
1851:
1849:
1846:
1844:
1841:
1839:
1836:
1834:
1831:
1830:
1828:
1826:
1822:
1819:
1817:
1813:
1810:
1808:
1804:
1790:
1787:
1783:
1782:Bedford Shale
1780:
1778:
1775:
1773:
1772:Sunbury Shale
1770:
1767:
1764:
1763:
1762:
1761:
1758:
1756:
1753:
1752:
1749:
1746:
1745:
1743:
1741:
1737:
1731:
1727:
1724:
1723:
1721:
1719:
1715:
1707:"Little Lime"
1706:
1703:
1701:
1698:
1696:
1693:
1691:
1688:
1686:
1683:
1682:
1681:
1680:
1677:
1675:
1672:
1671:
1668:
1665:
1664:
1662:
1660:
1656:
1653:
1651:
1647:
1635:
1632:
1629:
1626:
1624:
1621:
1620:
1619:
1618:
1615:
1613:
1610:
1609:
1604:
1601:
1599:
1596:
1594:
1591:
1588:
1585:
1582:
1579:
1578:
1577:
1576:
1572:
1568:
1566:
1563:
1562:
1560:
1558:
1554:
1545:
1542:
1540:
1537:
1535:
1532:
1530:
1527:
1526:
1525:
1524:
1521:
1519:
1516:
1515:
1509:
1506:
1505:
1504:
1503:
1499:
1495:
1493:
1490:
1489:
1484:
1481:
1478:
1475:
1473:
1470:
1468:"No. 4a Coal"
1467:
1464:
1463:
1462:
1461:
1458:
1456:
1453:
1452:
1447:
1444:
1441:
1438:
1435:
1432:
1430:
1427:
1425:
1422:
1421:
1420:
1419:
1416:
1414:
1411:
1410:
1405:
1402:
1400:
1397:
1395:"No. 6a Coal"
1394:
1391:
1389:
1386:
1384:
1381:
1378:
1375:
1374:
1373:
1372:
1368:
1364:
1362:
1359:
1358:
1356:
1354:
1350:
1342:
1339:
1337:"No. 7a Coal"
1336:
1335:Mahoning Coal
1333:
1331:
1328:
1326:
1323:
1322:
1321:
1320:
1317:
1315:
1312:
1311:
1306:
1303:
1301:
1298:
1296:
1293:
1291:
1288:
1286:
1283:
1281:
1278:
1276:
1273:
1271:
1268:
1266:
1263:
1262:
1261:
1260:
1257:
1255:
1252:
1251:
1246:
1243:
1241:
1238:
1236:
1233:
1231:
1228:
1226:
1223:
1221:
1218:
1217:
1216:
1215:
1211:
1207:
1205:
1202:
1201:
1199:
1197:
1193:
1184:
1181:
1179:
1176:
1174:"No 8a. Coal"
1173:
1170:
1168:
1165:
1163:
1160:
1158:
1155:
1152:
1149:
1147:
1144:
1142:
1139:
1137:
1134:
1133:
1132:
1131:
1127:
1123:
1122:
1117:
1114:
1111:
1108:
1106:"No. 10 Coal"
1105:
1102:
1100:
1097:
1095:
1092:
1090:
1087:
1085:
1082:
1080:
1077:
1075:"No. 11 Coal"
1074:
1071:
1070:
1069:
1068:
1064:
1060:
1058:
1055:
1054:
1049:
1046:
1044:
1041:
1039:
1036:
1034:
1031:
1029:
1026:
1024:
1021:
1020:
1019:
1018:
1014:
1010:
1008:
1007:Dunkard Group
1005:
1004:
1002:
1000:
996:
993:
991:
987:
984:
982:
978:
966:
963:
961:
958:
956:
953:
951:
948:
946:
943:
941:
938:
937:
936:
935:
931:
927:
926:
921:
918:
915:
913:
910:
908:
905:
903:
900:
898:
895:
893:
890:
888:
885:
883:
880:
878:
875:
873:
870:
868:
865:
863:
860:
858:
855:
854:
853:
852:
848:
844:
842:
841:Dunkard Group
839:
838:
836:
834:
830:
827:
825:
821:
818:
816:
810:
807:
805:
799:
795:
791:
784:
779:
777:
772:
770:
765:
764:
761:
754:
753:
749:
747:
744:
743:
739:
730:
717:
709:
702:
699:
694:
688:
684:
677:
675:
673:
669:
664:
660:
656:
652:
648:
644:
640:
636:
632:
628:
621:
618:
611:
606:
600:
595:
589:
585:
581:
577:
573:
572:Cherry Valley
568:
562:
555:
549:
547:
541:
536:
532:
529:
527:
523:
520:
518:
514:
513:
512:
509:
507:
503:
495:
493:
491:
487:
479:
477:
475:
470:
468:
464:
460:
455:
453:
449:
448:North America
445:
444:Kaskaskia Sea
436:
429:
425:
420:
413:
411:
409:
405:
401:
400:red sandstone
397:
393:
389:
384:
382:
378:
377:West Virginia
374:
370:
366:
362:
358:
354:
353:Clastic wedge
351:
347:
344:
334:
331:
327:
322:
319:
307:
296:
292:
289:
288:United States
278:
274:
271:
268:
264:
259:
256:
252:
249:
245:
242:
239:
235:
230:
226:
222:
219:
215:
211:
208:
204:
201:
197:
193:
189:
186:
182:
179:
176:
172:
168:
164:
160:
154:
149:
146:
142:
138:
133:
124:
121:
113:
102:
99:
95:
92:
88:
85:
81:
78:
74:
71: â
70:
66:
65:Find sources:
59:
55:
49:
48:
43:This article
41:
37:
32:
31:
19:
2774:
2656:Medina Group
2566:Salina Group
2522:Salina Group
2491:Salina Group
2451:Salina Group
2134:Burket Shale
2080:Sonyea Group
2017:
1976:
1755:Pocono Group
1659:Serpukhovian
1630:"No. 1 Coal"
1589:"No. 2 Coal"
1546:"No. 3 Coal"
1479:"No. 4 Coal"
1466:Clarian Coal
1442:"No. 5 Coal"
1436:"No. 6 Coal"
1379:"No. 7 Coal"
1185:"No. 8 Coal"
1112:"Great Lime"
907:Tenmile Coal
897:Dunkard Coal
877:Nineveh Coal
794:Pennsylvania
750:
716:cite journal
701:
682:
630:
626:
620:
553:
545:
510:
499:
483:
471:
456:
441:
385:
361:Pennsylvania
349:
345:
340:
324:Type section
306:Pennsylvania
167:Pennsylvania
163:Blair County
116:
107:
97:
90:
83:
76:
64:
52:Please help
47:verification
44:
2710:Utica Shale
1946:Huron Shale
1740:Tournaisian
1728:"Big Lime"
1628:Sharon Coal
446:in central
406:during the
357:sedimentary
178:sedimentary
3025:Categories
2622:Llandovery
2483:Ludfordian
2379:Lochkovian
2270:Moorehouse
1925:Ohio Shale
1557:Bashkirian
1196:Kasimovian
833:Cisuralian
612:References
526:Pratt Rock
521:Striations
404:deposition
335:, New York
110:April 2014
80:newspapers
2898:Furongian
2276:Edgecliff
1907:Elk Group
1825:Famennian
1353:Moscovian
663:129029014
588:Tennessee
467:petroleum
329:Named for
251:Siltstone
241:Sandstone
232:Lithology
224:Thickness
184:Underlies
2932:Series 2
2558:Homerian
2514:Gorstian
2231:Eifelian
2177:Givetian
2010:Frasnian
999:Gzhelian
655:30055593
576:New York
459:Catskill
381:Virginia
373:Maryland
365:New York
350:Catskill
343:Devonian
261:Location
206:Overlies
145:Devonian
2941:Stage 4
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2430:Pridoli
2361:Pragian
635:Bibcode
537:Members
348:or the
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237:Primary
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2325:Emsian
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266:Region
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2692:Upper
2316:Lower
1816:Upper
659:S2CID
651:JSTOR
255:shale
247:Other
101:JSTOR
87:books
729:help
687:ISBN
461:and
363:and
341:The
174:Type
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792:of
643:doi
586:to
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