- Usage in publication:
-
- Attalla conglomerate member*
- Modifications:
-
- Original reference
- Dominant lithology:
-
- Conglomerate
- Sandstone
- Breccia
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
Summary:
Attalla conglomerate member of Chickamauga limestone. Medium-grained sandstone to coarse conglomerate or breccia; in general composed mostly of rather small angular fragments of chert embedded in a siliceous matrix composed of comminuted chert or quartz. Thickness 20 to 40 feet. Basal member of Chickamauga in central and northeastern AL. Age is Early Ordovician (early Chazy).
[Named from exposures at Attalla, Etowah Co., northeastern AL.]
[GNC remark (US geologic names lexicon, USGS Bull. 896, p. 89): At request of C. Butts the name was in 1926 changed to Attalla chert conglomerate member.]
Source: US geologic names lexicon (USGS Bull. 896, p. 89).
- Usage in publication:
-
- Attalla formation
- Modifications:
-
- Revised
- Biostratigraphic dating
- Dominant lithology:
-
- Shale
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
Summary:
Pg. 45, 53, 55, chart 1 (facing p. 130). Attalla formation. Butts applied name Attalla to a coarse conglomerate, 20 to 40 feet thick, at base of Chickamauga limestone in Birmingham Valley, north-central Alabama. Conglomerate is patchy in occurrence. This conglomerate, together with red and green shales at base of the Chickamauga, which the writer [Cooper] includes in name Attalla, is suggestive of Blackford lithology of Tennessee and Virginia, but obviously deposited at a different time than Blackford. Except for Butts' use of name Chickamauga in Alabama, term has passed into disuse.
[ca. 1966, the USGS retains Attalla Chert Conglomerate Member of Chickamauga Limestone. Recognized in north-central Alabama. Age is Middle Ordovician.]
Source: US geologic names lexicon (USGS Bull. 1200, p. 168).
- Usage in publication:
-
- Attalla Conglomerate*
- Modifications:
-
- Revised
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
Summary:
Unit extended into northwest GA where it is raised in rank and referred to as the Attalla Conglomerate.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Attalla Chert Conglomerate Member
- Modifications:
-
- Revised
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
Summary:
Attalla Chert Conglomerate Member here assigned to the base of the Stones River Formation of the Chickamauga Group. Unit correlates with the Middle Ordovician Pond Spring Formation of TN and GA. Stones River is extended in this guidebook to AL and is used by the authors at formation rather than group rank.
Source: GNU records (USGS DDS-6; Reston GNULEX).
- Usage in publication:
-
- Attalla Chert Conglomerate Member*
- Modifications:
-
- Overview
- AAPG geologic province:
-
- Piedmont-Blue Ridge province
Summary:
The Attalla Chert Conglomerate Member of the Chickamauga Limestone in AL is assigned to the Stones River Formation of the Chickamauga Group in the Chickamauga terrane in AL, as used by Drahovzal and Neathery (1971). Age is Middle Ordovician.
Source: GNU records (USGS DDS-6; Reston GNULEX).
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 ([ ]).