Index Fossil - List of Common Index Fossils

List of Common Index Fossils

Fossil Scientific Name Time Period Million Years Ago

Calico Scallop		 Pecten gibbus
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		 Scaphites hippocrepis Cretaceous Period 145 to 66 million years ago

Inoceramus		 Inoceramus labiatus Cretaceous Period
Perisphinctes Perisphinctes tiziani Jurassic Period
Nerinea trinodosa Jurassic Period
Tropites subbullatus Triassic Period
Monotis subcircularis Triassic Period

Leptodus		 Leptodus americanus Permian Period
Parafusulina Parafusulina bosei Permian Period
Dictyoclostus americanus Pennsylvanian Period
Lophophyllidium proliferum Pennsylvanian Period
Cactocrinus multibrachiatus Mississippian Period
Prolecanites gurleyi Mississippian Period

Mucrospirifer		 Mucrospirifer mucronatus Devonian Period 416 to 359 million years ago
Palmatolepis unicornis Devonian Period
Silurian Period
Tetragraptus fructicosus Ordovician Period
Paradoxides Cambrian Period 540 million years ago
Billingselia corrugata Cambrian Period
Archeocyathids Lower Cambrian

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