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host mudrocks. Reduced clay content, grey colour and larger (approx. 10 mm), platy mud clasts distinguish this unit from the otherwise similar, lower sandstone. A thin (less than 1 cm) rim of tan claystone with abundant calcite veins separates the lower portion of the structure from the host mudrocks.
401:
succeeds vertically. This 25 cm thick unit is calcareous with a platy structure and grades upwards into a greenish grey blocky mudstone with some organics. This third unit encloses the upper portion of the sedimentary structure and bears a sharp, irregular contact with an overlying burrowed dark
396:
is greater than 35 cm in thickness, light greenish grey and weakly calcareous. This unit exhibits extensive dark reddish grey mottling over its uppermost portion. Additionally, carbonate nodules as much as 4.5 cm in diameter form a discontinuous layer of 20–25 cm below the sharp upper
413:
grains. Small (3–6 mm), rounded mud clasts are common in the coarser basal portion. This structureless unit fines upwards with an increasing clay content. A thin, 1–2 cm thick, grey claystone separates this lower sand- stone from an upper fine sandstone. The bedding parallels that of the
713:
Ullmann, P. V.; Varricchio, D.; Knell, M. J. (2012), "Taphonomy and taxonomy of a vertebrate microsite in the mid-Cretaceous (Albian–Cenomanian) Blackleaf
Formation, southwest Montana",
609:
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red claystone. The lithology of the structure contrasts sharply with the surrounding host mudrock and facilitates recognition of the structure in the field.
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The lower, bone-bearing portion consists of 25–30 cm of medium to fine, calcareous greenish-grey sandstone, moderately sorted with abundant
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816:
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811:
774:
728:
Varricchio, D. J.; Martin, A. J.; Katsura, Y. (2007), "First trace and body fossil evidence of a burrowing, denning dinosaur",
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770:"Angiosperms of the Northern Rocky Mountains: Albian to Campanian (Cretaceous) megafossil floras"
588:
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8:
354:
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body sitting within and crosscutting a succession of three mudrock units. The lowermost
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The following fossils were reported from the formation:
727:
712:
584:
List of fossiliferous stratigraphic units in
Montana
803:
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388:The formation comprises an isolated, sinuous
731:Proceedings of the Royal Society of London B
675:
327:
299:
647:
397:contact of the unit. A dark greenish-grey
751:
767:
775:Annals of the Missouri Botanical Garden
307:Blackleaf Formation (the United States)
16:Geologic formation in the United States
804:
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13:
817:Cretaceous System of North America
14:
888:
619:
417:
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272:
254:
47:
706:
812:Geologic formations of Montana
383:
1:
594:
335:Blackleaf Formation (Montana)
310:Show map of the United States
529:cf. Aspidophyllum trilobatum
212:Approximate paleocoordinates
7:
577:
10:
893:
522:Araliopsoides cf. cretacea
433:Oryctodromeus cubicularis
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877:Paleontology in Montana
768:Crabtree, D. R (1987),
644:Varricchio et al., 2007
589:Paleontology in Montana
543:cf. Celastrophyllum sp.
515:cf. Aralia wellingtonia
508:Araliaephyllum westonii
744:10.1098/rspb.2006.0443
483:Tyrannosauridae indet.
468:Goniopholididae indet.
463:Dromaeosauridae indet.
872:Ooliferous formations
453:Ankylosauridae indet.
852:Siltstone formations
842:Sandstone formations
672:Ullmann et al., 2012
571:cf. Protophyllum sp.
536:cf. Ficus ovatifolia
473:Hadrosauridae indet.
867:Lacustrine deposits
837:Mudstone formations
738:(1616): 1361–1368,
610:Blackleaf Formation
365:dating back to the
351:Blackleaf Formation
338:Show map of Montana
230: /
191: /
28:Stratigraphic range
22:Blackleaf Formation
822:Cretaceous Montana
716:Historical Biology
564:Platanophyllum sp.
495:Neopterygii indet.
458:Chelydridae indet.
355:geologic formation
550:Cinnamomoides sp.
478:Testudines indet.
347:
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862:Fluvial deposits
857:Deltaic deposits
847:Shale formations
832:Cenomanian Stage
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440:Bernissartia sp.
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788:10.2307/2399448
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361:. It preserves
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782:(4): 707–747,
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195:44.5°N 112.6°W
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128:Colorado Group
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280:United States
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234:45.9°N 72.3°W
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827:Albian Stage
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707:Bibliography
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447:Glyptops sp.
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411:volcanogenic
404:
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350:
348:
200:44.5; -112.6
42:105–94
633:Fossilworks
614:Fossilworks
407:plagioclase
384:Description
239:45.9; -72.3
237: /
198: /
173:Coordinates
32:late Albian
806:Categories
629:Lima Peaks
595:References
409:and other
375:Cretaceous
371:Cenomanian
36:Cenomanian
723:: 311–328
399:claystone
390:sandstone
161:siltstone
147:sandstone
134:Lithology
118:Formation
762:17374596
578:See also
426:Reptiles
394:mudstone
186:112°36′W
167:Location
143:Mudstone
796:2399448
753:2176205
363:fossils
359:Montana
268:Country
262:Montana
225:72°18′W
222:45°54′N
183:44°30′N
139:Primary
124:Unit of
794:
760:
750:
378:period
367:Albian
277:
259:
250:Region
792:JSTOR
501:Flora
353:is a
157:Shale
153:Other
758:PMID
635:.org
616:.org
489:Fish
349:The
114:Type
50:PreꞒ
784:doi
748:PMC
740:doi
736:274
631:at
612:at
369:to
357:in
808::
790:,
780:74
778:,
772:,
756:,
746:,
734:,
721:24
719:,
677:^
649:^
621:^
602:^
380:.
159:,
145:,
100:Pg
44:Ma
30::
786::
742::
105:N
95:K
90:J
85:T
80:P
75:C
70:D
65:S
60:O
55:Ꞓ
39:~
34:-
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