Stones River Groups undifferentiated in part (ALOsr;3)

Stones River Groups undifferentiated in part - medium to dark-gray thick to thin-bedded limestone, argillaceous in part, locally very fossiliferous. Contains a zone of bentonite and bentonitic shale near the top. Mapped seperately from the Nashville Group only in Jackson County.

State	Alabama
Name	Stones River Groups undifferentiated in part
Geologic age	Ordovician
Original map label	Osr
Primary rock type	limestone
Secondary rock type	bentonite
Other rock types	shale
Lithologic constituents	Major Sedimentary > Carbonate > Limestonemedium to dark-gray thick to thin-bedded limestone, argillaceous in part, locally very fossiliferous Incidental Sedimentary > Clastic > Mudstone > ShaleContains a zone of bentonite and bentonitic shale near the top. Sedimentary > Clastic > Mudstone > Claystone > BentoniteContains a zone of bentonite and bentonitic shale near the top.
Map references	Szabo, M. W., Osborne, E. W., Copeland, C. W. Jr., Neathery; T. L., 1988, Geologic Map of Alabama, Geological Survey of Alabama Special Map 220, scale 1:250,000. [http://www.ogb.state.al.us/ogb/ogb_gisdata/algeomap.zip]
Unit references	Szabo, M. W., Osborne, E. W., Copeland, C. W. Jr., Neathery; T. L., 1988, Geologic Map of Alabama, Geological Survey of Alabama Special Map 220, scale 1:250,000. [http://www.ogb.state.al.us/ogb/ogb_gisdata/algeomap.zip]
Geographic coverage	Jackson