The Geology of Texas - Vol. 1 - pages 462-463

In Arkansas the restricted Marlbrook marl of Dane, consisting of the marl conformably overlying the Annona chalk and unconformably underlying part a few fairly typical Exogyra cancellata (of which the most typical forms occur in the base of the Saratoga), and a variety of E. ponderosa which is transitional between the typical ponderosa and E. cancellata. Stephenson regards the Exogyra cancellata zone ( = Saratoga, in Arkansas) as the basal member of the Navarro, and considers as upper Taylor at least from Hunt County southward the 300 or more feet of marl overlying the Pecan Gap chalk (391, p. 44). In Kaufman County this marl has an estimated maximum thickness of 400 feet, and it thins eastwards. Apparently there is no distinct stratigraphic break between this marl and the underlying Pecan Gap from Collin County southward. The Pecan Gap grades upward into chalky marl containing locally thin chalk seams for at least 100 feet above the Pecan Gap. A single specimen of Exogyra ponderosa was found at this level at a locality on the Josephine road about 2 miles north by east of Nevada, Collin County. Above this level the marl is less chalky, and in places is a calcareous clay containing abundant fragments of Inoceramus and occasionally, poorly preserved, large, compressed Baculites, and other, unidentified fossils. East of Hunt County and specifically in central and eastern Red River County, the 500 feet of marl above the Pecan Gap chalk, though devoid of large fossils, may be of upper Taylor (Marlbrook) age (391, p. 47).

A high Taylor (?) sand in the Corsicana area has been called the Edens sand (1062, p. 228, pi. XX).

GEOLEX database

" Upper Cretaceous formation mapped in southeastern Collin Co, TX and Hunt Co, TX in northeast TX. Overlies Pecan Gap Chalk; underlies Neylandville Formation. Map unit described as clay, calcareous, variable amount of silt and glauconite; limestone bed in southern Collin Co 10-13 in thick, aphanitic, light gray, forms persistent scarp 180 ft above base; light yellowish gray; weathers light gray with poor fissility; marine megafossils scarce. Thickness 300+/-ft. "

" Upper Cretaceous formation mapped in continuous belt across northeast TX in northern Hunt, Delta, and northwest Bowie Cos, TX ; southeasternmost Fannin, southern Lamar, south-central Red River Cos, TX; and in a single outcrop area in southwestern Little River Co, AR . Overlies Pecan Gap Chalk west of Clarksville, Red River Co, TX; overlies Annona Chalk eastward into AR; overlain by Neylandville Formation west of Charleston, Delta Co, TX; overlain by Navarro Group eastward to the Red River. Is uppermost Cretaceous unit mapped in southwest AR part of the map area. Map unit described as marl--slightly glauconitic in upper part, highly plastic when wet, strikingly uniform throughout, medium bluish gray to yellowish gray; weathers light gray to white, forms smooth, rolling topography; marine megafossils scarce; thickness 150-450 ft, thins eastward. "