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Rocks
Basalt
Chert
Marl
Sedimentary Rock
- Crossbedding
Limestone

Rocks of Galveston Bay

Texas Geology
- Pleistoncene (10,000 - 15,000 years old) sediments are exposed by dredging and erosion.

Jetty rocks have been brought in from around Texas. These rocks are great representatives of the geological history of Texas.
----- Include:
----- Precambrian granites (1.1 billion years old)
----- Oligocene limestones (40 million) with Chert (flint)
----- Cretaceous (100 million)
----- Eocene (35 million)
----- Miocene sandstones (25 million)

Road Metals (fill)
----- Include:
----- Fossiliferous Oligocene reef materials (40 million)
----- Salt dome cap limestones (40 million)