| Thunder Bay Limestone | |
|---|---|
| Stratigraphic range: | |
| Type | Geological formation |
| Unit of | Traverse Group [1] |
| Sub-units | Partidge Point Member, Potter Farm Member, and Norway Point Member |
| Underlies | Kettle Point Formation and Squaw Bay Limestone |
| Overlies | Potter Farm Formation [1] |
| Location | |
| Region |  Michigan |
| Country |  United States |
The Thunder Bay Limestone is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.
| Conodonts reported from the Thunder Bay Limestone | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Icriodus | I. cymbiformis | [2] | Also found in the Detroit River, Traverse, Antrim, Ferron Point, Genshaw, Alpena and Norway Point formations. | ||
| I. expansus | [2] | Also found in the Detroit River, Traverse, Antrim, Lucas, Anderdon, Dundee, Bell, Ferron Point, Genshaw, Alpena, Potter Farm and Norway Point formations. | |||
| I. latericrescens latericrescens | [2] | Also found in the Traverse, Bell, Ferron Point, Genshaw, Newton Creek, Alpena, Four Mile Dam,,Norway Point and Potter Farm formations. | |||
| Polygnathus | P. varcus | [2] | Also found in the Traverse, Antrim, Alpena, Four Mile Dam and Norway Point formations. | ||
| Placoderms reported from the Thunder Bay Limestone | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Ptyctodus | P. sp. | "Northeast shore of Partridge Point, 6.4 kilometers south of Alpena". [1] | A tooth plate (UMMP 3023). [1] | A ptyctodontid. |  |
| Brachiopods reported from the Thunder Bay Limestone | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Pentamerella | P. proteus | [3] | |||
| Spinulicosta | S. mutocosta | [3] | Also found in the Bell, Rockport Quarry, Ferron Point, Four Mile Dam, Beebe School and Potter Farm formations. | ||
| Cnidarians reported from the Thunder Bay Limestone | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Syringopora | S. ehlersi | Bluffs on northeast shore of Partridge Point, 4 miles south of Alpena, Alpena County. [4] | A tabulate coral. |  | |
| Echinoderms reported from Thunder Bay Limestone | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Corocrinus | C. pettyesi | Bluffs on northeast shore of Partridge Point, 4 miles south of Alpena, Alpena County. [5] | A crinoid. | ||
| Gennaeocrinus | G. romingeri | Bluffs on northeast shore of Partridge Point, 4 miles south of Alpena, Alpena County. [5] | A crinoid. | ||
| Trilobites reported from the Thunder Bay Limestone | |||||
|---|---|---|---|---|---|
| Genus | Species | Presence | Material | Notes | Images |
| Dechenella | D. (Basidechenella) reimanni | Alpena County, Michigan. [6] | |||
| D. (Basidechenella) sp. C | Alpena County, Michigan. [6] | A single specimen. [6] | |||
| Dipleura | D. dekayi | Partridge Point on Thunder Bay, about 4 miles south of Alpena. [6] | Also found in the Norway Point Formation. |  | |
| Greenops | G. alpenensis | Alpena County, Michigan. [6] | |||
| Phacops | P. iowensis | Alpena County, Michigan. [6] | Also found in the Potter Farm and Petoskey formations. | ||
| Proetus | P. (Crassiproetus) alpenensis | [6] | Also found in the Potter Farm Formation. | ||
Viverravidae is an extinct monophyletic family of mammals from extinct superfamily Viverravoidea within the clade Carnivoramorpha, that lived from the early Palaeocene to the late Eocene in North America, Europe and Asia. They were once thought to be earliest carnivorans and ancestral to extant carnivorans, but now are placed outside the order Carnivora based on cranial morphology as a relatives to extant carnivorans.
The Marcellus Formation or the Marcellus Shale is a Middle Devonian age unit of sedimentary rock found in eastern North America. Named for a distinctive outcrop near the village of Marcellus, New York, in the United States, it extends throughout much of the Appalachian Basin.
Hexagonaria is a genus of colonial rugose coral. Fossils are found in rock formations dating to the Devonian period, about 350 million years ago. Specimens of Hexagonaria can be found in most of the rock formations of the Traverse Group in Michigan. Fossils of this genus form Petoskey stones, the state stone of Michigan. They can be seen and found in most Midwestern states.
Paleontology in Wisconsin refers to paleontological research occurring within or conducted by people from the U.S. state of Wisconsin. The state has fossils from the Precambrian, much of the Paleozoic, and the later part of the Cenozoic. Most of the Paleozoic rocks are marine in origin. Because of the thick blanket of Pleistocene glacial sediment that covers the rock strata in most of the state, Wisconsin’s fossil record is relatively sparse. In spite of this, certain Wisconsin paleontological occurrences provide exceptional insights concerning the history and diversity of life on Earth.
The Detroit River Group is a geologic group in Michigan and Ohio. It preserves fossils dating back to the Devonian period.
The Traverse Group is a geologic group in Michigan, comprising middle Devonian limestones with calcareous shale components. Its marine fossils notably include Michigan's state stone, the Petoskey stone, among other corals and records of ancient marine life. A range of trilobites has also been found in the Traverse Group.
The Four Mile Dam Formation, also called the Four Mile Dam Limestone, is a geologic formation in Michigan. It preserves fossils dating back to the middle Devonian period.
The Gravel Point Formation is a geologic formation in western Michigan. It preserves fossils dating back to the middle Devonian period and correlates with the Long Lake Limestone and Alpena Limestone.
The Norway Point Formation is a geologic formation in Michigan. It preserves fossils dating back to the middle Devonian period.
The Dundee Limestone is a geologic formation in Michigan, Ohio and Ontario. It preserves fossils dating back to the Devonian period.
The Sonyea Group is a geologic group in the northern part of the Appalachian Basin. It preserves fossils dating back to the Devonian period.
The Genesee Group is a geologic formation in Pennsylvania. It preserves fossils dating back to the Devonian period.
The Lithograph City Formation is a geologic formation in Iowa, part of the Cedar Valley Group. It preserves fossils dating back to the Devonian period. The formation is composed of dolomite and limestone, with many fossils and vugs in the lower part, while the upper part contains few fossils.
The Quatsino Limestone is a geologic formation in British Columbia. It preserves fossils dating back to the Triassic period.
Icriodus is an extinct conodont genus in the family Gnathodontidae.
Ptyctodus is an extinct armour-plated fish of the late Devonian. Ptyctodus belongs to the family Ptyctodontidae and is of the class Placodermi. They share a close resemblance to modern day chimaeras (Holocephali). Fossils of this armour-plated fish have been found in locations such as in Russia, the Michigan Basis, and Arizona, United States.
The Anderdon Limestone is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.
The Rockport Quarry Limestone is a geologic formation in Michigan. It preserves fossils dating back to the middle Devonian period.
The Long Lake Limestone is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.
The Squaw Bay Limestone is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period. The ammonoid Koenenites has been found in this formation.
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