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Faill, R.T., Glover, A.D., and Way, J.H., 1989, Geology and mineral resources of the
Blandburg, Tipton, Altoona, and Bellwood quadrangles, Blair, Cambria, Clearfield and Centre Counties, Pennsylvania: Pennsylvania Geological Survey Topographic and Geologic Atlas, 4th series, 86, 209 p., scale
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Grabau, A.W., 1909, Physical and faunal evolution of North
America during Ordovicic, Siluric, and Early Devonic time: Journal of Geology, v. 17, p. 209-252.
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Berg, T.M., Edmunds, W.E., Geyer, A.R. and others, compilers, (1980). Geologic Map of
Pennsylvania: Pennsylvania Geologic Survey, Map 1, scale 1:250,000.
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Berg, T.M., et al., (1983). Stratagraphic
Correlation Chart of Pennsylvania: G75, Pennsylvania Geologic Survey, Harrisburg, Pennsylvania.
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426:"Bedrock Geologic Map of The Mc Alevys Fort Quadrangle, Huntingdon, Centre, and Mifflin Counties, Pennsylvania"
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of the Bald Eagle has always been interpreted as mostly terrestrial or shallow marine deposits resulting in a
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period, being deposited between 488.3 and 443.7 (±10) million years ago. It rests conformably atop the
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The Bald Eagle is defined as a gray to olive-gray and grayish-red, fine to coarse-grained
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Very few fossils exist in the Bald Eagle
Formation, and most of them are
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member, called the Lost Run Member, exists in some locations.
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Relative age dating of the Bald Eagle places it in the Upper
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in the Bald Eagle
Formation, from the Skytop Roadcut where
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Natural outcrop of the Bald Eagle
Formation visible from
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Northeastern United States geologic formation stubs
206:Close-up of outcrop of Bald Eagle Formation, where
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362:The Bald Eagle is a good source of road material,
431:. Pennsylvania Geological Survey. Archived from
370:inclusions may lead to acidic rainwater runoff.
277:. However, at the base of the formation is the
424:Doden, Arnold G. & Gold, David P. (2008).
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492:A panorama of the Bald Eagle portion of the
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608:Sandstone formations of the United States
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41:Outcrop of Bald Eagle Formation, where
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512:are overturned. The beds are highly
145:Pennsylvania, Maryland, West Virginia
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284:marker bed, which contains abundant
182:is a mapped bedrock unit in central
613:Ordovician geology of Pennsylvania
598:Ordovician System of North America
551:. You can help Knowledge (XXG) by
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358:, Huntingdon County, Pennsylvania
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508:up is to the left, and thus the
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540:This article about a specific
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366:and building stone. However,
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307:and conformably below the
520:at right. February 2001.
261:sequence produced by the
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255:depositional environment
249:Depositional environment
603:Upper Ordovician Series
474:Geology of Pennsylvania
226:and lens cap for scale.
451:Cite journal requires
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618:Appalachian Mountains
547:in Pennsylvania is a
502:Pennsylvania Turnpike
387:1:24,000 and 1:48,000
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192:Appalachian Mountains
136:Appalachian Mountains
342:. Scale bar is 1 cm.
305:Reedsville Formation
180:Bald Eagle Formation
84:Reedsville Formation
19:Bald Eagle Formation
332:Bald Eagle Mountain
159:Bald Eagle Mountain
25:Stratigraphic range
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222:. Note prominent
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309:Juniata Formation
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74:Juniata Formation
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212:Tussey Mountain
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542:stratigraphic
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506:Stratigraphic
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336:Centre County
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315:Economic Uses
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286:Orthorynchula
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279:Orthorynchula
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275:trace fossils
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243:conglomeratic
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188:ridge-forming
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553:expanding it
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444:cite journal
433:the original
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340:Pennsylvania
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224:crossbedding
220:Pennsylvania
216:Blair County
190:unit in the
184:Pennsylvania
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169:A. W. Grabau
150:Type section
117:conglomerate
55:Pennsylvania
51:Blair County
496:roadcut in
368:iron pyrite
289:brachiopods
232:crossbedded
198:Description
93:275 +/-25 m
65:sedimentary
592:Categories
374:References
301:Ordovician
177:Ordovician
29:Ordovician
545:formation
356:Shade Gap
239:greywacke
235:sandstone
155:Named for
107:sandstone
98:Lithology
90:Thickness
70:Underlies
500:for the
468:See also
354:west of
330:crosses
210:crosses
166:Named by
127:Location
80:Overlies
45:crosses
518:faulted
494:Narrows
269:Fossils
259:molasse
208:Rt. 164
103:Primary
43:Rt. 164
27:: Late
514:folded
364:riprap
324:Pyrite
142:Extent
132:Region
436:(PDF)
429:(PDF)
241:. A
121:shale
113:Other
549:stub
516:and
510:beds
457:help
328:I-99
253:The
175:The
62:Type
504:.
295:Age
237:or
594::
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446:}}
442:{{
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455:(
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
