Keywords: GeopetalCarboniferousNV.jpg en Thin-section of peloid sediment and sparry calcite cement in a recrystallized bivalve shell showing way up thus a geopetal structure ; limestone of the Bird Spring Formation Carboniferous of southern Nevada own Wilson44691 2009-11-08 Photograph taken by Mark A Wilson Department of Geology The College of Wooster http //www3 wooster edu/geology/MWilson html Limestone in thin section Carboniferous fossils from Nevada Stratigraphy Calcite Unidentified Bivalvia fossils |