Formations
Rock units collectors and dealers name on a label: age, lithology, members, what is found in them.
A
- Arapey basalt (Serra Geral)— Early Cretaceous unit, Artigas · Rio Grande do Sul
B
- Bird Spring Formation— Pennsylvanian unit, Nevada · California
- Blue Lias Formation— Early Jurassic unit, Dorset · Somerset · Warwickshire · Glamorgan
- Bone Valley Formation— Miocene unit, Florida
- Bundenbach (Hunsrück Slate)— Early Devonian unit, Rhineland-Palatinate
- Burgess Shale— Miaolingian unit, British Columbia
C
- Calvert Formation— Miocene unit, Maryland · Virginia
- Coon Creek Formation— Late Cretaceous unit, Tennessee · Mississippi
E
- El Otfal Formation— Middle Devonian unit, Alnif · Issoumour · Jbel Issoumour · Drâa-Tafilalet
F
- Fezouata Formation— Early Ordovician unit, Zagora · Drâa-Tafilalet
- Fort Payne Formation— Mississippian unit, Tennessee · Alabama · Kentucky · Georgia
G
- Green River Formation— Eocene unit, Wyoming · Utah · Colorado
H
- Hawthorn Group— Miocene unit, Florida · Georgia · South Carolina
- Hell Creek Formation— Late Cretaceous unit, Montana · North Dakota · South Dakota · Wyoming
- Hermit Formation— Cisuralian unit, Arizona
- Holzmaden (Posidonia Shale)— Early Jurassic unit, Baden-Württemberg
J
- Judith River Formation— Late Cretaceous unit, Montana
K
- Kem Kem Group— Late Cretaceous unit, Drâa-Tafilalet · Taouz · Erfoud
- Kimmeridge Clay Formation— Late Jurassic unit, Dorset · Wiltshire · Oxfordshire · Cambridgeshire
- Kope Formation (Cincinnatian)— Late Ordovician unit, Ohio · Kentucky · Indiana
L
- Lance Formation— Late Cretaceous unit, Wyoming
- London Clay Formation— Eocene unit, Kent · Essex · West Sussex · Hampshire
M
- Mahantango Formation— Middle Devonian unit, Pennsylvania · New York · Maryland · West Virginia
- Marjum Formation— Miaolingian unit, Utah
- Mazon Creek (Francis Creek Shale)— Pennsylvanian unit, Illinois
- Morrison Formation— Late Jurassic unit, Colorado · Utah · Wyoming · Montana
N
- Navesink Formation— Late Cretaceous unit, New Jersey
- Niobrara Formation— Late Cretaceous unit, Kansas · Nebraska · Colorado · South Dakota
O
- Ohio Shale— Late Devonian unit, Ohio · Kentucky
- Oulad Abdoun Basin phosphates— Late Cretaceous unit, Khouribga · Béni Mellal-Khénifra
- Oxford Clay Formation— Middle Jurassic unit, Cambridgeshire · Bedfordshire · Oxfordshire · Wiltshire
P
- Peace River Formation— Miocene unit, Florida
- Pierre Shale— Late Cretaceous unit, South Dakota · Wyoming · Colorado · Montana
R
- Ripley Formation— Late Cretaceous unit, Mississippi · Alabama · Tennessee · Georgia
S
- Santana Group (Crato and Romualdo formations)— Early Cretaceous unit, Ceará · Pernambuco · Piauí
- Silica Formation— Middle Devonian unit, Ohio · Michigan
- Solnhofen Limestone— Late Jurassic unit, Bavaria · Eichstätt
- Stone City Formation (Whiskey Bridge)— Eocene unit, Texas
T
- Two Medicine Formation— Late Cretaceous unit, Montana
W
- Waldron Shale— Wenlock unit, Indiana · Tennessee
- Wheeler Shale— Miaolingian unit, Utah
Y
- Yixian Formation (Jehol Biota)— Early Cretaceous unit, Liaoning · Hebei · Inner Mongolia
- Yorktown and Pungo River formations (Lee Creek)— Pliocene unit, North Carolina · Virginia