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Ammonites and Nautiloids are found in all Cretaceous Formations. Listed below the scientific name is the Geological Formation each were found in. Some ammonites are found in multiple formations, others in only one. See the Central Texas Formations page for more specific finds from each Formation.
Mariella brazoensis
Mariella brazoensis
Georgetown Formation
Adkinsia bosquensis
Adkinsia bosquensis
Del Rio Formation
Barroisiceras dentatocarinatum
Barroisiceras dentatocarinatum
Austin Chalk Formation
Engonoceras stolleyi
Engonoceras stolleyi
Walnut Formation
Submantelliceras brazoense
Submantelliceras brazoense
Del Rio Formation
Budaiceras elegantior
Budaiceras elegantior
Buda Formation
Metengonoceras sp.
Metengonoceras sp.
Walnut Formation
Budaiceras hyatti
Budaiceras hyatti
Buda Formation
Oxytropodiceras elaboratum
Oxytropodiceras elaboratum
Walnut Formation
Eupchydiscus jimenezi
Eupchydiscus jimenezi
Ozan/Austin Chalk Formation
Boehmoceras arculus
Boehmoceras arculus
Ozan/Austin Chalk Formation
Baculites capensis
Baculites capensis
Ozan/Austin Chalk Formation
Anisoceras sp.
Anisoceras sp.
Del Rio Formation
Dufrenoyia dufrenoyi
Dufrenoyia dufrenoyi
Glen Rose Formation
Engonocerid serpentinum
Engonocerid serpentinum
Del Rio Formation
Otoscaphites subevolutus
Otoscaphites subevolutus
Del Rio Formation
Stoliczkaia dispar
Stoliczkaia dispar
Buda Formation
Engonoceras gibbosum
Engonoceras gibbosum
Comanche Peak Formation
Mortoniceras equidistans
Mortoniceras equidistans
Georgetown Formation
Mortoniceras whitneyi
Mortoniceras whitneyi
Georgetown Formation
Platiknemiceras flexuosum
Platiknemiceras flexuosum
Glen Rose Formtion
Pachydiscus travisi
Pachydiscus travisi
Austin Chalk Formation
Eopachydiscus sp.
Eopachydiscus sp.
Duck Creek Formation
Protoengonoceras gabbi
Protoengonoceras gabbi
Walnut Formation
Paracalycoceras crotaloides
Paracalycoceras crotaloides
Del Rio Formation
Sharpeiceras mexicanum
Sharpeiceras mexicanum
Buda Formation
Faraudiella archerae
Faraudiella archerae
Buda Formation
Oxytropidoceras texanum
Oxytropidoceras texanum
Walnut Formation
Idiohamites varians
Idiohamites varians
Georgetown Formation
Hypacanthoplites mayfieldensis
Hypacanthoplites mayfieldensis
Glen Rose Formation
Unknown Ammonite
Unknown Ammonite
Corsicana Formation
Baculites sp.
Baculites sp.
Ozan/Austin Formation
Unknown Ammonite
Unknown Ammonite
Del Rio Formation
Baculites columna
Baculites columna
Corsicana Formation
Unknown Ammonite
Unknown Ammonite
Georgetown Formation
Cephalopod Pen Shell
Cephalopod Pen Shell
Corsicana Formation
Unknown Ammonite
Unknown Ammonite
Ozan/Austin Chalk Formation
Mariella worthensis
Mariella worthensis
Del Rio Formation
Paracalycoceras crotaloides
Paracalycoceras crotaloides
Buda Formation
Bevahites bevahensis
Bevahites bevahensis
Ozan/Austin Chalk Formation
Texanites (Plesiotexanites) stangeri
Texanites (Plesiotexanites) stangeri
Ozan/Austin Chalk Formation
Nowakites flaccidicostus
Nowakites flaccidicostus
Ozan/Austin Chalk Formation
Cymatoceras hilli
Cymatoceras hilli
Georgetown Formation
Paracymatoceras texanus
Paracymatoceras texanus
Grayson Formation
Eutrophoceras campbelli
Eutrophoceras campbelli
Austin Chalk Formation
Eutrophoceras planoventer
Eutrophoceras planoventer
Corsicana Formation
Cymatoceras elegens
Cymatoceras elegens
Austin Chalk Formation
Belemnite
Belemnite
Walnut Formation
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