Select late Paleocene fossils from the Bighorn Basin
(please do not reproduce anything on this page without permission of author and University of Michigan Museum of Paleontology; © 1998, 2004)
Upper teeth tentatively referred to Microcosmodon conus and Microcosmodon?. A–C, Microcosmodon conus R P4 (UM 109661, Y2K Quarry), A, lingual, B, buccal, C occlusal. D, Microcosmodon? L maxilla fragment, P 2-3? occlusal view (UM 109660, Y2K Quarry). E–F Microcosmodon conus R I2, P1? (UM 81696, SC-165). Late Tiffanian (Ti-5b).
Adunator minutus dentary from Y2K Quarry, buccal view (scale in 0.5 mm). Late Tiffanian (Ti-5b).
Leptacodon packi from Y2K Quarry, right dentary in buccal (top) and lingual (bottom) views (scale in 0.5 mm). Late Tiffanian (Ti-5b).
Dentary and maxilla of Palaeoryctes jepseni Bloch, Secord, Gingerich (2004) from Y2K Quarry. A–B, holotype (UM 109156) of right dentary p3-m3, in buccal (A) and lingual (B) views. C, maxilla P3-M3, in occlusal view (UM 109458, Y2K-Quarry).
Right dentary (UM 109111) of Carpolestes dubius with root of i1, p1-m2 in buccal view, from Y2K Quarry, late Tiffanian (Ti-5b).
Composite p4-m3 (UM 61535, 61531, 61532, 61535, from left to right) of Chiromyoides caesor from SC-243 anthills in occlusal (A) and buccal (B) views. Middle Tiffanian (T-4b).
Paromomyids from the Bighorn Basin. A-B, right dentary of Phenacolemur pagei (YPM-PU 14030, cast) from Princeton Quarry (Ti-5a) in buccal (A) and occlusal (B) views. C-E right dentary of Ignacius frugivorus (UM 77268) from Divide Quarry (Ti-4a) in buccal (C), occlusal (D), and lingual (E) views.
Right maxilla (UM 83236) of Plesiadapis churchilli from Divide Quarry. P2-M3 in buccal (A) and occlusal (B) views. Middle Tiffanian (Ti-4a).
Left maxilla (UM 108480) in occlusal view preserving P3-M3 of Leptolambda churchilli from SC-397. Middle Tiffanian (Ti-4b).
Iyad Zalmout having just discovered pantodont hind limb.
Articulated hind limb of pantodont (Leptolambda churchilli). Middle Tiffanian (Ti-4b).
Exposures of middle Tiffanian Fort Union Formation (gray mudstones on right) unconformably overlying late Cretaceous Lance Formation (on left) in Foster Gulch area of Bighorn Basin.
Exposures of latest Tiffanian (Ti-6) Fort Union Formation on Polecat Bench.
Carbon Basin, southwestern Wyoming
Right dentary of Periptychus cf. carinidens with p2-m1 from Carbon Basin (UW 26382, see Secord, 1998). Earliest Tiffanian (Ti-1).
Unconformity in the Hanna Formation, Carbon Basin. Early Tiffanian (Ti-1) rocks below, middle Tiffanian (Ti-4) above (see Secord, 1998).