Download Major Groups of Fossils Found in Cretaceous Formations in Texas

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Major Groups of Fossils Found in
Cretaceous Carbonate Formations in Texas
SEA URCHINS, STARFISH, etc.
Echinoids
(means “spiny’)
Sea biscuits or Sea urchins
AMMONITES, SQUID, etc.
Cephalapods
(means “head foot’)
Ammonites (fossil only),
Chambered Nautilus, Squid, Octopus
Normal Marine Salinity
Slightly Tolerant of Salinity Deviations
ALGAE, Calcareous Green Algae
Aquatic plants with calcareous skeletons
Porocystis, an algal fruiting-body
Extremely Tolerant of Salinity Deviations
SNAILS
Gastropods
(means “stomach foot’)
Sea snails, preserved as internal molds
BIVALVES
Pelecypods
Nerinia
(means “hatchet foot’)
Clams, Oysters
Rudistids (fossil only) -
Toucasia,
Monopleura
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