Cretaceous <--- Period:

Pennsylvanian Period: --->

Phylum Arthropoda:
• Class - Arachnomorpha
SubPhylum - Crustacea	Penn.

Phylum Mollusca:
• Class - Cephalopoda
Ammonites	Penn.
Nautilus / Nautiloid	Penn.
Turrilites
Baculites
Belemnites
Scaphites
Hamites
• Class - Gastropoda	Penn.
• Class - Bivalvia (Pelecypoda)
Oysters	Penn.
Clams	Penn.
Scallops (Pectens)
Rudists
• Class - Scaphopoda
• Class - Rostroconchia	Penn.

Phylum Brachiopoda:
• Class - Brachiopoda	Penn.

Phylum Echinodermata:
• Class - Asteroidea
• Class - Echinoidea
regular urchins	Penn.
irregular urchins
• Class - Crinoidea	Penn.

Phylum Chordata:
•  Fish	Penn. / Perm.
•  Sharks	Penn.
•  Rays, sawfish
•  Mammals
•  Reptiles  (terrestrial) -      dinosaurs, turtles,      crocodiles, lizards
•  Reptiles  (marine) -      mosasaurs, ichthyosaurs,      plesiosaurs, pliosaurs
• C. Synapsida (Dimetrodon)
• C. Sauropsida (pterosaurs)

Phylum Conulariida:

• Class - Conularids

Phylum Cnidaria:
• Class: Anthozoa (coral)	Penn.
• Class: Scyphozoa (jellyfish)

Phylum Bryozoa:

• Class - Bryozoans

Phylum Porifera:
• Class - Sponges	Penn.

Phylum Protozoa:

• Class - Foraminiferida

Phylum Annelida:
worm tubes	Penn.

Plants:
leaves, roots	Penn.

Trace fossils:
Trace fossils (burrows, tracks)	Penn.

Minerals - crystals:

various

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North-Central Texas Geological Formations (Cretaceous Period):

Navarro   Group
Taylor   Group	Marlbrook Marl
	Pecan Gap Chalk
	Annona Chalk
	Wolfe City Sand
	Ozan Fm.
Austin   Group	Gober Chalk
	Brownstown Marl
	Blossom Sand
	Austin Chalk
Eagle Ford   Group	Arcadia Park Fm.
	Britton Fm.
	Tarrant Fm.
Woodbine   Group	Woodbine Fm.
Washita   Group	Grayson Marl
	Main Street Ls.
	Pawpaw Fm.
	Weno Ls.
	Denton Clay
	Fort Worth Ls.
	Duck Creek Fm.
	Kiamichi Fm.
Fredericks-   burg Group	Goodland Ls.
	Walnut Clay
	Paluxy Fm.
Trinity   Group	Glen Rose Fm.
	Twin Mountains

Older Cretaceous, Jurassic, and Triassic layers do not exist in north-central Texas but do exist in west Texas.

North-Central Texas Geological Formations (Permian Period):
Geological map and Stratigraphic chart
	(marine)	(terrestrial)
Pease  River  Group	Blaine Fm.
	San Angelo Fm.
Clear  Fork  Group	Choza Fm.
	Vale Fm.
	Arroyo Fm.
Albany   Group	Lueders Fm.	Waggoner Ranch
	Clyde Fm.
	Belle Plains Fm.	Petrolia
	Admiral Fm.	Nocona
Cisco   Group	Putnam Fm.	Archer City
	Moran Fm.
	Pueblo Fm.	Markley

North-Central Texas Geological Formations (Pennsylvanian Period):
Cisco  Group	Harpersville Fm.	Markley
	Thrifty-Graham Fm.
Canyon   Group	Ranger Limestone
	Placid Shale
	Winchell Ls --   Chico Ridge Ls.
	Wolf Mountain Sh.
	Palo Pinto Fm.
Strawn  Group	Mineral Wells Fm.
	Brazos River Fm.
	Mingus Fm.
	Grindstone Creek Fm.
	Lazy Bend Fm.
Older Pennsylvanian layers are not exposed at surface level in north-central Texas.

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Central-South Texas Geological Formations (Cretaceous Period):

Pepper Sh.

Buda Ls.

Del Rio Clay (= Grayson Fm.)

Georgetown Ls. (= Duck Creek Ls. .     through Mainstreet Fm.)

Edwards Ls.

Comanche Peak Ls.

Walnut Sh.

Paluxy Sand

Glen Rose Ls.

Miscellaneous:

Street signs