In 1974, Keith Young concluded, based on ammonite zonation, that the formation ranges from late Upper Aptian into the Lower Albian,[5] about 115-105 million years old.

[6] Individual steps that form this distinctive stair-step topography extend for many miles without any apparent change in expression.

[9] The Glen Rose has been divided into upper and lower portions, separated by a one-foot layer of Corbula shells, a small bivalve.

Upper Cretaceous formations follow, starting with the Del Rio Clay, Buda Limestone, and then the Eagle Ford Group.

The Hammett and the lower portion of the Upper Glen Rose act as confining units (or aquitard) for the Middle Trinity Aquifer.

Martin Lockley (1995) concludes that the tracks most likely represent twelve sauropods "probably as a herd, followed somewhat later by three theropods that may or may not have been stalking -- but that certainly were not attacking.

[31] The fact that some of the Glen Rose trackways primarily include marks of the fore feet led Bird and others to suggest that the sauropods were semi-aquatic and made the tracks when partially swimming, a scenario that "has become deeply entrenched in the popular literature..."[33] Again, Lockley discounts that theory, stating that the tracks were not well preserved or studied and that the view of sauropods as swimming "can not be supported using any convincing line of available evidence.

"[32] Claims that human footprints have been found in the Glen Rose is discussed in the Dinosaur Valley State Park article.