Youngest of three named divisions of Midway sediments that crop out in northwestern Louisiana and outline the highest structural portion of Sabine uplift. Consists of basal sand member, middle lignitic shale member, and upper calcareous member. Overlies Logansport formation (new). Age is Paleocene (Midway).
Source: US geologic names lexicon (USGS Bull. 1200, p. 1650-1651).
Pg. 13. Hall Summit formation. Includes (ascending) Loggy Bayou, Grand Bayou, and Bistineau members (all new). Age is Paleocene.
Source: US geologic names lexicon (USGS Bull. 1200, p. 1650-1651).
Pg. 48 (fig. 2), 58-60; G.E. Murray, 1948, Louisiana Dept. Conserv. Geol. Bull., no. 25, p. 127-129, pl. 10. Hall Summit formation. Maximum thickness more than 300 feet in northern Sabine Parish; thins to north and west to an estimated 150 feet in Shelby County, Texas. Underlies Marthaville formation; overlies Logansport formation; both contacts gradational. Age is Paleocene. Type locality designated.
Type locality: exposures in vicinity of village of Hall Summit in T. 14 N., R. 9 W., Red River Parish, LA.
Source: US geologic names lexicon (USGS Bull. 1200, p. 1650-1651).
For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.
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