Grayson's Bluff
Grayson's Bluff on Lake Grapevine, extreme NW end. You'll find a Upper Cretaceous Limestone bed with scallops, gryphae and brachipods.

Hulen Creek

The location is along a creek near the SW corner of Hulen and Bellaire in Fort Worth. You will find clams, snails, echinids (sea urchins), and ammonites in a Upper Cretaceaous Marl/Limestone bed.

Dallas Baptist College

There are two sites near the Dallas Baptist College. The main site one has an Upper Cretaceous Shale bed with small ammonites and ammonite impressions. East on Kiest Blvd, on the hill, is a shaly Austin Chalk outcrop with sharks teeth.

Elm Fork, Dallas

A stretch of the Elm Fork of the Trinity River between Carpenter Freeway and US-35 is a good hunting place during low water intervals. Along the the lower banks and in the river bed are Upper Cretaceous Shales and Marl beds with surprisingly well preserved ammonites, pelecypods and other period fossils.