Members
In the Bighorn Basin region along the Montana - Wyoming border, the Cloverly is divided into several members.
- Pryor Conglomerate lies at the base and contains abundant black chert. It is named from thick beds exposed on the west side of the Pryor Mountains.
- The Little Sheep Member lies in the middle and is composed of pale-purple, gray to almost white, bentonitic mudstone. A radiometric date of 115 +/- 10 MA has been obtained from low in the member (Chen and Lubin 1997), and other near the top at 108.5 +/- 0.2 MA (Burton et al. 2006). These dates confirm that the Cloverly is Aptian-Albian in age.
- The uppermost member is the Himes Member contains some coarse grained channel deposits, but is primarily brightly, multicolored (variegated) mudstones.
Read more about this topic: Cloverly Formation
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