Stratigraphic relationships of the Annona Chalk and Gober Chalk (Upper Campanian) type localities in Northeast Texas and Southwest Arkansas
Reference:
Thompson,L.B. et al. (1978)
Stratigraphic relationships of the Annona Chalk and Gober Chalk (Upper Campanian) type localities in Northeast Texas and Southwest Arkansas Transactions of the Gulf Coast Association of Geological Societies
Vol. 28 P. 665- 679