Geology and Age
The Wayan occurs in eastern Idaho. Sediments are dominantly floodplain mudstones (some pedogenic) with some fluvial sandstones and minor conglomerates, limestones, and tuffs. Carbonate nodules in pedogenic mudstones suggest a semi-arid, seasonal climate during deposition. Radiometric U-Pb dates from detrital zircons indicate an early to middle Cenomanian age.
The Wayan is equivalent to the upper Cedar Mountain Formation of Utah, the Aspen Shale of Wyoming, and the Blackleaf Formation of Montana.
Read more about this topic: Wayan Formation
Famous quotes containing the word age:
“My age is as a lusty winter,
Frosty but kindly.”
—William Shakespeare (1564–1616)