Usage:
Blockhouse Shale (GA,TN*)
Blockhouse Shale of Chickamauga Group (TN)
Subunits:
(alphabetical) --all in TN*: Toqua Sandstone Member, Whitesburg Limestone Member.
Geologic age:
Late Ordovician (Mohawkian; Turinian)*
Type section, locality, area and/or origin of name:
Type section: base of section 800 ft southwest of bench mark F132Y (972 ft elevation) extending souteastward up a gullied hillside, Blockhouse quadrangle, Blount Co., TN (Neuman, 1955).
AAPG geologic province:
Appalachian basin*
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
Asterisk (*) indicates published by U.S. Geological Survey authors.
"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).
Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).