1. Thermal maturity map showing subsurface elevation of 0.8 percent vitrinite reflectance in the Greater Green River Basin of Wyoming, Colorado, and Utah Yale Public content 1986. 2002-06-01T04:00:00Z. 2016-06-16T15:40:49Z. Geological Survey (U.S.). The Survey ; For sale by Branch of Distribution. English. Public. Green River Watershed (Wyo.-Utah).