Gizzard Group, including Signal Point Shale, Warren Point Sandstone, and Raccoon Mountain Formation (TNPAg;8)

Gizzard Group - Shale, siltstone, sandstone, and conglomerate; from base of Sewannee Conglomerate to top of Mississippian. Thickness 0 to 520 feet, including Signal Point Shale - Mostly dark-gray to light-brown shale, with minor siltstone. Wilder coal near top. Thickness 0 to 180 feet, average about 60 feet; Warren Point Sandstone - Sandstone and conglomeratic sandstone, gray to brown, fine- to medium-grained, locally interbedded with shale containing coal. Thickness 0 to 300 feet, thins from southeast to northwest, average thickness about 100 feet; Raccoon Mountain Formation - Shale, siltstone, and sandstone. Bon Air coal near top; White Oak and Sale Creek coals near base. Thickness 0 to 260 feet.

State	Tennessee
Name	Gizzard Group, including Signal Point Shale, Warren Point Sandstone, and Raccoon Mountain Formation
Geologic age	Pennsylvanian
Original map label	Pg
Comments	East-Central sheet
Primary rock type	sandstone
Secondary rock type	shale
Other rock types	siltstone; conglomerate
Lithologic constituents	Major Sedimentary > Clastic > Sandstone Minor Sedimentary > Clastic > Siltstone Sedimentary > Clastic > Mudstone > Shale Incidental Sedimentary > Coal Sedimentary > Clastic > Conglomerate
Map references	Geology available at Tennesse Spatial Data Server which can be found at http://www.tngis.org/geology.html which links to a USGS Water Resources Division site: http://water.usgs.gov/lookup/getspatial?geo250k Tennessee Spatial Data Server site notes: Thanks goes to Jim Julian for researching this improved geology layer from the Tennessee Division of Geology. Note - The Tennessee Division of Geology does not endorse this coverage, stating this version is still incomplete and not fit for distribution. [http://www.tngis.org/geology.html] [http://water.usgs.gov/lookup/getspatial?geo250k]
Unit references	Geology available at Tennesse Spatial Data Server which can be found at http://www.tngis.org/geology.html which links to a USGS Water Resources Division site: http://water.usgs.gov/lookup/getspatial?geo250k Tennessee Spatial Data Server site notes: Thanks goes to Jim Julian for researching this improved geology layer from the Tennessee Division of Geology. Note - The Tennessee Division of Geology does not endorse this coverage, stating this version is still incomplete and not fit for distribution. [http://www.tngis.org/geology.html] [http://water.usgs.gov/lookup/getspatial?geo250k] Hardeman, W.D., and others, 1966, Geologic map of Tennessee: Division of Geology, Tennessee Department of Environment and Conservation, scale 1:250,000