The Finlay Limestone is a geologic formation in western Texas, southern New Mexico, and northern Chihuahua.

It preserves fossils dating back to the early Cretaceous period.

[1][2] The formation is composed of massive gray limestone with a few thin beds of brown sandstone, with a total thickness of 130–426 feet (40–130 m).

[2] The formation is highly fossiliferous, containing fossils characteristic of early Cretaceous Albian and Comanchean age.

[2] The formation includes carbonate replacement deposits of lead, zinc, and silver in northern Mexico, along the Chihuahua CRD belt.