| State | Alabama |
|---|---|
| Name | Chilhowee Group undifferentiated |
| Geologic age | Cambrian |
| Lithologic constituents |
Major
Sedimentary > Clastic > Mudstone (Bed)Weisner and Wilson Ridge Formations undifferentiated -- silty mudstone; Nichols Formation -- massive to laminated greenish-gray and black micaceous mudstone; Cochran Formation -- mudstone.
Sedimentary > Clastic > Sandstone > Arkose (Bed)Weisner and Wilson Ridge Formations undifferentiated -- interbedded quartzose to slightly feldspathic sandstone; Nichols Formation -- very fine-grained sandstone; Cochran Formation -- poorly sorted arkosic sandstone.
Sedimentary > Clastic > Mixed-clastic > Conglomerate-sandstone (Bed)Weisner and Wilson Ridge Formations undifferentiated -- laterally continous conglomerate in ledge-forming units; Cochran Formation -- poorly sorted arkosic sandstone and conglomerate
Minor
Sedimentary > Clastic > Siltstone (Bed)Nichols Formation -- containing minor interbeds of siltstone; Cochran Formation -- containing interbedded greenish-gray siltstone
Unconsolidated > Fine-detrital > Silt (Bed)Weisner and Wilson Ridge Formations undifferentiated -- silty mudstone
|
| Comments | The unit label 'Cch' is used twice in the same province (Valley and Ridge Province (eastern part)) and each have slightly different descriptions; so added a 2 to the 'map_symbol1' field name in order to distinguish the two. They follow in descending order on the map. |
| References | Szabo, M.W., Osborne, E.W., Copeland, C.W. Jr., and Neathery, T.L., 1988, Geologic Map of Alabama, Geological Survey of Alabama Special Map 220, scale 1:250,000. |
| NGMDB product | |
| Counties | Calhoun - Cherokee - Cleburne - Talladega |