Stratigraphy and Facies Across Lower Devonian-Middle Devonian Boundary, Central Nevada

A regressive episode near the end of the Early Devonian caused a nearshore quartzose carbonate facies to shift to the edge of the carbonate shelf in central Nevada. Transgression followed in the latest Early Devonian and continued in the early Middle Devonian. Seaward of the shelf-wide unconformity produced by regression, a dolomitized, dark-gray lime wackestone-packstone with abundant crinoidal debris formed on the inner slope of a silled outer...