List of index fossils
Index fossils (also known as guide fossils or indicator fossils) are fossils used to define and identify geologic periods (or faunal stages).

List of index fossils

Section Title:
Table Section Text: Index fossils (also known as guide fossils or indicator fossils) are fossils used to define and identify geologic periods (or faunal stages).

Fossil	Scientific Name	Time Period	Million Years Ago

-	Argopecten gibbus	Quaternary Period	1.8 million years ago

Neptunea tabulata	Quaternary Period	1.8 million years ago

-	Viviparus glacialis	Tiglian (Early Pleistocene)	0.5 million years ago

Calyptraphorus velatus	Tertiary Period

Venericardia planicosta	Eocene

-	Scaphites hippocrepis	Cretaceous Period	145 to 66 million years ago

-	Inoceramus labiatus	Cretaceous Period

-	Perisphinctes tiziani	Jurassic Period	201.3 to 145 million years ago

Nerinea trinodosa	Jurassic Period

Tropites subbullatus	Triassic Period	145 to xxx million years ago

-	Monotis subcircularis	Triassic Period

-	Leptodus americanus	Permian Period	xxx to xxx million years ago

Parafusulina	Parafusulina bosei	Permian Period

Dictyoclostus americanus	Pennsylvanian Period	xxx to xxx million years ago

Lophophyllidium proliferum	Pennsylvanian Period

Cactocrinus multibrachiatus	Mississippian Period	xxx to 416 million years ago

Prolecanites gurleyi	Mississippian Period

Mucrospirifer mucronatus Silica Shale.JPG Mucrospirifer	Mucrospirifer mucronatus	Devonian Period	416 to 359 million years ago

Palmatolepis unicornis	Devonian Period

Silurian Period	359 to xxx million years ago

Tetragraptus fructicosus	Ordovician Period	xxx to 509 million years ago

-	Paradoxides	Cambrian Period	509 to 500 million years ago

Billingselia corrugata	Cambrian Period

Archeocyathids.JPG	Archaocyathids	Lower Cambrian	529 to 509 million years ago

Sentence(s)

Perisphinctes lived during the Jurassic Epochs, and serve as an index fossil for that time period.

final_sentence: Perisphinctes lived during the Jurassic Epochs, and serve as an index fossil for that time period.