Skip to main content
U.S. flag

An official website of the United States government

Paleowetland deposits showing black mat

Detailed Description

Wetland deposits at the Murray Springs Paleoindian Site in southeastern Arizona. Megafaunal remains and Clovis-age artifacts dating to ~13,000 years before present have been found under the dark "black mat" layer near the middle of the exposure (just above the white Coro Marl), marking a time of significant climatic, faunal, and human transition in North America. 


Public Domain.