115:
526:) comprises sandstones with some conglomerates and siltstones of early Triassic age. It ranges from less than 90m to over 220m in thickness. It has been known in the past as the Bunter Pebble Beds and the Chester Pebble Beds Formation. There are a couple of reference sections for this sequence in the vicinity of Chester.
556:
in
Worcestershire), the Helsby Sandstone Formation is early Triassic to Anisian in age and comprises variously coloured sandstones whose bases are frequently conglomeratic, together with mudstones and siltstones. The thickness of the formation is variable but reaches around 500m in the Worcester
565:
The
Wildmoor Sandstone Formation (named from the Worcestershire locality of Wildmoor, north of Bromsgrove) is a 0 - 284m thick sequence of sandstones formerly known as the Upper Mottled Sandstone or Wildmoor Beds. It also includes some mudstones and siltstones.
458:) comprises around 250m thickness of sandstone with conglomerate and siltstone which occurs across the Cheshire Basin. Older literature includes it as part of the Lower Keuper Sandstone. It is often divided into an upper
538:
on the
England/Wales border west of Chester) is a sequence which ranges from 0m to over 150m thickness of largely aeolian sandstones of early Triassic age. It was formerly known as the Lower Mottled Sandstone.
626:
includes the
Kibbleston Formation (named from the Staffordshire locality of Kibbleston) which is underlain by the Wildmoor Formation which is in turn underlain by the Kidderminster Formation.
654:
On the
Cumbrian coast the Group comprises the Calder Sandstone Formation and the underlying St Bees Sandstone Formation. The former is around 500m thick and includes sandstones of both
670:. The Kirklinton Sandstone Formation in places overlies the Calder Sandstone Formation in the Carlisle and Vale of Eden basins of north and east Cumbria. A sandstone which underlies
752:
114:
358:
into the
English Midlands, though are very largely concealed by superficial sediments. They occur widely through the Midlands (though usually concealed) and notably in an
151:, Wildmoor Sandstone, Kidderminster, Chester, Kinnerton Sandstone, Tarporley Siltstone, Helsby Sandstone, Upper Mottled Sandstone and Lower Mottled Sandstone formations
1061:
578:) is a 0 - 200m thick sequence of conglomerates and sandstones previously known as either the Bunter Pebble Beds or the Kidderminster Conglomerate Formation.
502:
in
Cheshire) comprises up to 900m thickness of early Triassic sandstones with occasional siltstones. It was earlier known as the Upper Mottled Sandstone. In
1066:
999:
686:
The group is represented in
Somerset and east Devon by the Otterton Sandstone and the underlying Budleigh Salterton Pebble Beds formations,.
662:
origin. The latter is between 400 and 600m thick and includes some siltstone and claystone beds. It overlies the varied lithologies of the
1071:
756:
557:
area. It is often encountered in older literature as the Lower Keuper
Sandstone. The formation includes the Shepshed Sandstone Member.
1086:
359:
1076:
638:) which is underlain by the Hawksmoor Formation (named from the Staffordshire locality of Hawksmoor) which includes the
312:
634:
The rock succession in the
Needwood Basin includes the Hollington Formation (named from the Staffordshire locality of
642:, a conglomerate and which is in turn underlain by the Huntley Formation (named from the Staffordshire locality of
424:
The Group comprises different sequences in each of the various basins in which it is developed as described below.
1081:
635:
1101:
1096:
433:
643:
667:
335:. They are mostly obscured by superficial deposits but the highest coastal cliffs in northwest England at
215:
1091:
599:
466:. Faulted blocks of these rocks are largely responsible for the prominent west facing escarpment of the
159:
272:
173:
148:
128:
363:
735:
611:
467:
375:
978:
British Geological Survey 1:50,000 scale geological map sheet (England and Wales series) no 37
769:
British Geological Survey 1;50,000 scale geological map sheet (England and Wales series) no 28
995:
966:
British Geological Survey 1:50,000 scale geological map sheets (England and Wales series) 124
655:
304:
269:
138:
954:
British Geological Survey 1:50,000 scale geological map sheet (England and Wales series) 123
939:
British Geological Survey 1:50,000 scale geological map sheet (England and Wales series) 155
899:
British Geological Survey 1:50,000 scale geological map sheet (England and Wales series) 141
823:
British Geological Survey 1:50,000 scale geological map sheets (England and Wales series) 97
811:
British Geological Survey 1:50,000 scale geological map sheet (England and Wales series) 96
727:
535:
503:
487:
386:
316:
291:
which is underlain by rocks of this age. It has economic importance as the reservoir of the
280:
715:
355:
347:
288:
284:
253:
169:
858:
795:
1035:
British Geological Survey 1:50,000 scale geological map (England) sheets 325, 326, 327
623:
483:
439:
367:
1055:
1011:
739:
678:
is known as the Sellafield Member and is assigned to the Helsby Sandstone Formation.
586:
Formerly known locally as the Polesworth Formation (from the Warwickshire village of
575:
418:
292:
73:
38:
872:
844:
926:
912:
886:
731:
701:
442:, which also extends into north Shropshire. It comprises the following formations:
351:
336:
320:
470:
and the Helsby Sandstone is exposed in numerous localities here, southwards from
755:. United Kingdom Offshore Oil and Gas Industry Association. 2012. Archived from
414:
406:
276:
48:
602:) is of Induan/Olenekian age. Also encountered as the Hopwas or Moira Breccia.
339:
are formed in the St Bees Sandstone, the lowermost formation within the group.
17:
671:
659:
587:
553:
343:
328:
93:
58:
716:"The South Morecambe Field, Blocks 110/2a, 110/3a, 110/8a, UK East Irish Sea"
398:
394:
211:
197:
98:
552:
Once known locally as the Bromsgrove Sandstone Formation (from the town of
499:
479:
475:
390:
371:
332:
308:
266:
207:
88:
83:
68:
63:
53:
663:
523:
471:
410:
324:
230:
103:
78:
455:
451:
402:
610:
The Lenton Sandstone Formation (named from the Nottingham suburb of
574:
The Kidderminster Formation (named from the Worcestershire town of
534:
The Kinnerton Sandstone Formation (named from the twin villages of
450:
The Helsby Sandstone Formation (named from the Cheshire village of
675:
379:
590:), the Chester Formation here is of ?Olenekian to Anisian age.
598:
The Moira Formation (named from the Leicestershire village of
303:
These rocks are found in northwest England as far north as
994:(5th edn) Keyworth, Nottingham British Geological Survey
498:
The Wilmslow Sandstone Formation (named from the town of
279:) which is widespread in Britain, especially in the
295:gas field, the second largest gas field in the UK.
249:
244:
236:
226:
221:
203:
193:
188:
180:
165:
155:
144:
134:
124:
32:
927:"BGS Lexicon of Named Rock Units - Result Details"
913:"BGS Lexicon of Named Rock Units - Result Details"
887:"BGS Lexicon of Named Rock Units - Result Details"
873:"BGS Lexicon of Named Rock Units - Result Details"
859:"BGS Lexicon of Named Rock Units - Result Details"
845:"BGS Lexicon of Named Rock Units - Result Details"
796:"BGS Lexicon of Named Rock Units - Result Details"
702:http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=SSG
522:The Chester Formation (named from the city of
514:are distinguished at the top of the sequence.
438:The sequence is most thickly developed in the
119:St Bees Sandstone, St Bees South Head, Cumbria
8:
714:Stuart, I. A.; Cowan, G. (1 January 1991),
992:British Regional Geology: Northern England
781:British Geological Survey 1:625,000 scale
113:
29:
950:
948:
720:Memoirs of the Geological Society, London
1062:Geological groups of the United Kingdom
807:
805:
783:Bedrock geology UK South & UK North
694:
753:"Oil and Gas from the Western Basins"
454:where the type section is exposed at
7:
704:(BGS on-line lexicon of rock units)
1012:"BGS Lexicon of Named Rocks Units"
482:, spectacularly at the outlier of
342:In the northeast they extend from
25:
682:Southwest England rock succession
646:). They are all of Scythian age.
385:There are further occurrences in
27:Triassic lithostratigraphic group
543:English Midlands rock succession
1067:Geologic formations of England
732:10.1144/GSL.MEM.1991.014.01.66
630:Needwood Basin rock succession
618:Stafford Basin rock succession
614:) is of Induan/Olenekian age.
512:Thurstaston Hard Sandstone Bed
428:Cheshire Basin rock succession
1:
530:Kinnerton Sandstone Formation
561:Wildmoor Sandstone Formation
508:Thurstaston Sandstone Member
494:Wilmslow Sandstone Formation
323:and then extending down the
139:New Red Sandstone Supergroup
486:hill and lastly within the
366:. They extend south to the
283:. The name is derived from
1118:
1072:Geology of Nottinghamshire
606:Lenton Sandstone Formation
548:Helsby Sandstone Formation
536:Higher and Lower Kinnerton
446:Helsby Sandstone Formation
431:
1087:Triassic System of Europe
1016:British Geological Survey
370:and beyond there through
307:(and extending just into
112:
37:
434:Geology of Alderley Edge
263:Sherwood Sandstone Group
33:Sherwood Sandstone Group
650:Cumbria rock succession
570:Kidderminster Formation
668:Cumbrian Coastal Group
990:Stone P. et al 2010.
378:on the coast of East
354:, then south through
160:Mercia Mudstone Group
1077:Sandstone formations
174:Cumbrian Coast Group
149:Bromsgrove Sandstone
364:Leek, Staffordshire
299:Geographical extent
39:Stratigraphic range
468:Mid Cheshire Ridge
389:north and east of
376:Budleigh Salterton
346:south through the
270:lithostratigraphic
1000:978-0-85272-652-5
582:Chester Formation
518:Chester Formation
510:and the 2m thick
259:
258:
16:(Redirected from
1109:
1082:Triassic England
1047:
1033:
1027:
1026:
1024:
1022:
1008:
1002:
988:
982:
976:
970:
964:
958:
952:
943:
937:
931:
930:
923:
917:
916:
909:
903:
897:
891:
890:
883:
877:
876:
869:
863:
862:
855:
849:
848:
841:
835:
821:
815:
809:
800:
799:
792:
786:
779:
773:
767:
761:
760:
749:
743:
742:
711:
705:
699:
506:, the 60m thick
488:Peckforton Hills
387:Northern Ireland
281:English Midlands
117:
108:
45:
30:
21:
1117:
1116:
1112:
1111:
1110:
1108:
1107:
1106:
1102:Sherwood Forest
1097:Olenekian Stage
1052:
1051:
1050:
1034:
1030:
1020:
1018:
1010:
1009:
1005:
989:
985:
977:
973:
965:
961:
953:
946:
938:
934:
925:
924:
920:
911:
910:
906:
898:
894:
885:
884:
880:
871:
870:
866:
857:
856:
852:
843:
842:
838:
822:
818:
810:
803:
794:
793:
789:
780:
776:
768:
764:
751:
750:
746:
713:
712:
708:
700:
696:
692:
684:
652:
632:
620:
608:
596:
594:Moira Formation
584:
572:
563:
550:
545:
532:
520:
496:
464:Delamere Member
460:Frodsham Member
448:
436:
430:
356:Nottinghamshire
348:Vale of Mowbray
301:
289:Nottinghamshire
285:Sherwood Forest
275:(a sequence of
254:Sherwood Forest
170:Roxby Formation
120:
107:
106:
101:
96:
91:
86:
81:
76:
71:
66:
61:
56:
51:
43:
42:
28:
23:
22:
18:Moira Formation
15:
12:
11:
5:
1115:
1113:
1105:
1104:
1099:
1094:
1089:
1084:
1079:
1074:
1069:
1064:
1054:
1053:
1049:
1048:
1028:
1003:
983:
971:
959:
956:Stoke-on-Trent
944:
932:
918:
904:
892:
878:
864:
850:
836:
816:
801:
787:
774:
762:
759:on 2013-06-28.
744:
706:
693:
691:
688:
683:
680:
651:
648:
631:
628:
624:Stafford Basin
619:
616:
607:
604:
595:
592:
583:
580:
571:
568:
562:
559:
549:
546:
544:
541:
531:
528:
519:
516:
495:
492:
484:Beeston Castle
447:
444:
440:Cheshire Basin
429:
426:
405:and along the
368:Severn Estuary
300:
297:
257:
256:
251:
247:
246:
242:
241:
238:
234:
233:
228:
224:
223:
219:
218:
205:
201:
200:
195:
191:
190:
186:
185:
182:
178:
177:
167:
163:
162:
157:
153:
152:
146:
142:
141:
136:
132:
131:
126:
122:
121:
118:
110:
109:
102:
97:
92:
87:
82:
77:
72:
67:
62:
57:
52:
47:
46:
44:Induan–Anisian
35:
34:
26:
24:
14:
13:
10:
9:
6:
4:
3:
2:
1114:
1103:
1100:
1098:
1095:
1093:
1090:
1088:
1085:
1083:
1080:
1078:
1075:
1073:
1070:
1068:
1065:
1063:
1060:
1059:
1057:
1046:
1042:
1038:
1032:
1029:
1017:
1013:
1007:
1004:
1001:
997:
993:
987:
984:
981:
975:
972:
969:
963:
960:
957:
951:
949:
945:
942:
936:
933:
928:
922:
919:
914:
908:
905:
902:
896:
893:
888:
882:
879:
874:
868:
865:
860:
854:
851:
846:
840:
837:
834:
830:
826:
820:
817:
814:
808:
806:
802:
797:
791:
788:
784:
778:
775:
772:
766:
763:
758:
754:
748:
745:
741:
737:
733:
729:
725:
721:
717:
710:
707:
703:
698:
695:
689:
687:
681:
679:
677:
673:
669:
665:
661:
657:
649:
647:
645:
641:
637:
629:
627:
625:
617:
615:
613:
605:
603:
601:
593:
591:
589:
581:
579:
577:
576:Kidderminster
569:
567:
560:
558:
555:
547:
542:
540:
537:
529:
527:
525:
517:
515:
513:
509:
505:
501:
493:
491:
489:
485:
481:
477:
473:
469:
465:
461:
457:
453:
445:
443:
441:
435:
427:
425:
422:
420:
416:
412:
408:
404:
400:
396:
392:
388:
383:
381:
377:
373:
369:
365:
361:
357:
353:
349:
345:
340:
338:
334:
330:
326:
322:
319:) and in the
318:
314:
310:
306:
298:
296:
294:
293:Morecambe Bay
290:
286:
282:
278:
274:
271:
268:
264:
255:
252:
248:
243:
239:
235:
232:
229:
225:
220:
217:
213:
209:
206:
202:
199:
196:
192:
187:
183:
179:
175:
171:
168:
164:
161:
158:
154:
150:
147:
143:
140:
137:
133:
130:
127:
123:
116:
111:
105:
100:
95:
90:
85:
80:
75:
70:
65:
60:
55:
50:
40:
36:
31:
19:
1092:Induan Stage
1044:
1040:
1036:
1031:
1019:. Retrieved
1015:
1006:
991:
986:
979:
974:
967:
962:
955:
940:
935:
921:
907:
901:Loughborough
900:
895:
881:
867:
853:
839:
832:
828:
824:
819:
812:
790:
782:
777:
770:
765:
757:the original
747:
723:
719:
709:
697:
685:
653:
640:Hulme Member
639:
633:
621:
609:
597:
585:
573:
564:
551:
533:
521:
511:
507:
497:
463:
462:and a lower
459:
449:
437:
423:
407:Lagan Valley
384:
352:Vale of York
341:
337:St Bees Head
321:Vale of Eden
302:
262:
260:
245:Type section
216:conglomerate
726:: 527–541,
456:Helsby Hill
417:and on the
415:Newtownards
327:coast into
277:rock strata
1056:Categories
1021:19 January
771:Whitehaven
690:References
672:Sellafield
660:fluviatile
636:Hollington
588:Polesworth
554:Bromsgrove
432:See also:
397:, between
393:, east of
344:Hartlepool
329:Lancashire
240:widespread
184:over 1500m
176:and others
968:Ashbourne
941:Coalville
813:Liverpool
740:140723122
399:Dungannon
395:Cookstown
250:Named for
212:siltstone
198:sandstone
189:Lithology
181:Thickness
156:Underlies
145:Sub-units
1045:Bridport
1041:Sidmouth
980:Gosforth
833:Nantwich
831:and 122
500:Wilmslow
480:Utkinton
476:Frodsham
474:through
409:beneath
391:Limavady
372:Somerset
350:and the
333:Cheshire
325:Cumbrian
309:Scotland
305:Carlisle
267:Triassic
222:Location
208:mudstone
166:Overlies
829:Chester
825:Runcorn
664:Permian
656:aeolian
644:Huntley
524:Chester
472:Runcorn
421:coast.
411:Belfast
360:outlier
311:around
231:England
227:Country
194:Primary
135:Unit of
1043:&
1037:Exeter
998:
827:, 109
785:sheets
738:
612:Lenton
504:Wirral
452:Helsby
419:Antrim
403:Armagh
317:Gretna
237:Extent
736:S2CID
676:Drigg
600:Moira
380:Devon
313:Annan
273:group
265:is a
204:Other
129:Group
1023:2019
996:ISBN
674:and
666:age
658:and
622:The
413:and
401:and
331:and
315:and
261:The
125:Type
49:PreꞒ
728:doi
478:to
374:to
362:at
287:in
1058::
1039:,
1014:.
947:^
804:^
734:,
724:14
722:,
718:,
490:.
382:.
214:,
210:,
172:,
99:Pg
41::
1025:.
929:.
915:.
889:.
875:.
861:.
847:.
798:.
730::
104:N
94:K
89:J
84:T
79:P
74:C
69:D
64:S
59:O
54:Ꞓ
20:)
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
