Beartooth Butte Formation
The Beartooth Butte Formation is a geologic formation in Wyoming. It preserves fossils dating back to the Devonian period.
Description
The formation contains a basal limestone conglomerate overlain by evenly bedded red or gray limestones and calcareous shales. It is a lenticular, channel-fill deposit which is some wide and thick at maximum. Most collections are from the talus slope. Stable oxygen and isotope data indicate that the Beartooth Butte Formation was deposited in an estuarine environment, with the Cottonwood Canyon section being slightly less saline than the type section.Fossil content
The following fossils have been reported from the formation:;FishAllocryptaspis ellipticusA. flabelliformisAnarthraspis chamberliniA. montanusBryantolepis brachycephalusB. cristatusBryantolepis majorB. obscurusBulbocanthus rugosusCardipeltis bryantiC. richardoniCosmaspis transversaLampraspis tuberculataMachaeracanthus minorOnchus penetransO. peracutusProtaspis brevispinaP. mcgrewiUranolophus wyomingensisAethaspis sp.Cephalaspis sp.Simblaspis sp.
;ArthropodsAcanthoscorpio mucronatusBranchioscorpio richardsoniHydroscorpius denisoniPraearcturus sp.
;FloraPsilophyton wyomingenseDrepanophycus devonicusEuphyllophytina sp.Gosslingia sp.
;Invertebrates