Pg. 234-237; AAPG Bull., v. 10, no. 1, p. 7. St. Maurice formation of Harris and later writers is here divided into three formations, named (descending) St. Maurice beds [restricted], and Cane River beds. St. Maurice [restricted] includes the beds above Sparta sand and below Yegua formation, ranges in thickness from 100 to 150 feet, and consists of alternating beds of sands and clays, the sands are massive, cross-bedded, and laminated, and contain considerably more ferruginous sandstone than is present in underlying Sparta sand. The clays are gray, green, red, and brown. The glauconitic beds are usually massive, but the sandier clays and lignitic clays are often laminated. Basal and upper beds are fossiliferous and at least one other fossiliferous horizon occurs between these two horizons. [Age is middle Eocene.]
[Named from exposures at St. Maurice, Winn Parish, northwestern LA.]

Source: US geologic names lexicon (USGS Bull. 896, p. 1884).

†St. Maurice formation (restricted). These beds in Louisiana have been called Minden beds by Campbell and Miller (1928), Mount Lebanon formation by Shearer (1930), Crockett by Ellisor (1929), and Cook Mountain formation. They are same as Cook Mountain formation of Texas (middle Eocene), which has priority, and are now known by that name. For a short time the Sparta sand was treated as a member of Cook Mountain formation, but that usage is now discontinued, and the Sparta is treated as a distinct formation by the USGS.

Source: US geologic names lexicon (USGS Bull. 896, p. 1884).