Rockport Quarry Limestone
The Rockport Quarry Limestone is a geologic formation in Michigan. It preserves fossils dating back to the middle Devonian period.

Stratigraphy of the Devonian deposits of the northern part of the Lower Peninsula of Michigan, showing the Rockport Quarry Limestone[1]
Rockport Quarry Limestone | |
---|---|
Stratigraphic range: | |
Type | Geological formation |
Unit of | Traverse Group |
Underlies | Ferron Point Formation[1] |
Overlies | Bell Shale[1][2] |
Thickness | Approximately 14 meters[2] |
Location | |
Region | ![]() |
Country | ![]() |
Fossil content
Color key
|
Notes Uncertain or tentative taxa are in small text; |
Vertebrates
The Devonian vertebrate fauna of the Rockport Quarry Limestone is the most diverse in Michigan.[1]
Acanthodians
Acanthodians reported from the Rockport Quarry Limestone | |||||
---|---|---|---|---|---|
Genus | Species | Presence | Material | Notes | Images |
?Machaeracanthus | ?M. sp. | A single specimen (UMMP 13047).[1] | |||
Cartilaginous fish
Cartilaginous fish reported from the Rockport Quarry Limestone | |||||
---|---|---|---|---|---|
Genus | Species | Presence | Material | Notes | Images |
Phoebodus | P. cf. P. sophiae | Alpena, Michigan.[3] | A tooth.[3] | An early elasmobranch. | |
?Tamiobatis | ?T. sp. | "At the abandoned Kelly Island Limestone Quarry at Rockport State Park, Alpena County".[1] | A single small spine (UMMP 13147).[1] | A ctenacanthoid. | ![]() |
Placoderms
Placoderms reported from the Rockport Quarry Limestone | |||||
---|---|---|---|---|---|
Genus | Species | Presence | Material | Notes | Images |
Dinomylostoma | D. sp. | [1] | An arthrodire. | ||
Dunkleosteus | D. sp. | Rockport Quarry, Alpena County.[1] | A single incomplete right anterior ventrolateral (UMMP 16152).[1] | An arthrodire. | ![]() |
Holonema | ?H. rugosum | A single specimen (UMMP 3898).[1] | An arthrodire. | ||
H. sp. | 26 specimens.[1] | An arthrodire. | ![]() | ||
Mylostoma | M. sp. | A single specimen (UMMP 13612).[1] | An arthrodire. | ||
Placodermi | At the abandoned Kelly Island Limestone Quarry at Rockport State Park, Alpena County.[1] | 2 specimens (7M, VP. 522.)[1] | Placoderms of unknown affinity. | ![]() | |
Protitanichthys | P. rockportensis | 59 specimens.[1] | An arthrodire. | ![]() | |
Ptyctodus | P. sp. | A single specimen (UMMP 13045).[1] | A ptyctodontid. | ![]() | |
Brachiopods
Brachiopods reported from the Rockport Quarry Limestone | |||||
---|---|---|---|---|---|
Genus | Species | Presence | Material | Notes | Images |
Chonetes | C. mediolatus | [4] | Also found in the Bell Shale, Ferron Point Formation and St. Laurent Limestone. | ||
Pentamerella | P. sp. B | Basal 8 inches of the formation.[4] | 2 specimens.[4] | ||
Pholidostrophia | P. gracilis gracilis | [4] | Also found in the Bell, Ferron Point and Genshaw formations. | ||
Schizophoria | S. ferronensis | Basal 8 inches of the formation.[4] | Also found in the Bell Shale, Ferron Point Formation and Silica Shale. | ||
Schuchertella | S. crassa | [4] | Also found in the lower Bell Shale, Ferron Point Formation and Arkona Shale. | ||
Spinulicosta | S. mutocosta | [4] | Also found in the Bell, Ferron Point, Four Mile Dam, Beebe School, Thunder Bay and Potter Farm formations. | ||
Strophodonta | S. extenuata rockportensis | Lower 8 inches of the formation.[4] | |||
Tylothyris | T. rockportensis | [5] | Appears to be endemic to the Michigan Basin. | ||
T. subvaricosa | [5] | Also found in the Cedar Valley, Milwaukee, Mineola, Bell, Ferron Point, Genshaw, Alpena, Gravel Point, Norway Point and Potter Farm formations. | |||
Bryozoans
Bryozoans reported from the Rockport Quarry Limestone | |||||
---|---|---|---|---|---|
Genus | Species | Presence | Material | Notes | Images |
Fenestellidae | Species A | [2] | |||
Species B | [2] | ||||
Species C | [2] | ||||
Trepostomata | Species A | [2] | |||
Species B | [2] |
Crustaceans
Crustaceans reported from the Rockport Quarry Limestone | |||||
---|---|---|---|---|---|
Genus | Species | Presence | Material | Notes | Images |
Ostracoda | [2] | ||||
Phlyctiscapha | P. rockportensis | Basal part of the formation.[6] | An ostracod. | ||
Echinoderms
Echinoderms reported from the Rockport Quarry Limestone | |||||
---|---|---|---|---|---|
Genus | Species | Presence | Material | Notes | Images |
Crinoidea | "Observed as disaggregated ossicles, ossicles stacked en echellon, and fragments of columnals".[2] | ||||
Molluscs
Molluscs reported from the Rockport Quarry Limestone | |||||
---|---|---|---|---|---|
Genus | Species | Presence | Material | Notes | Images |
Cephalopoda | "All specimens collected as single-hand specimens".[2] | ||||
Gastropoda | [2] | ||||
Sponges
Sponges reported from the Rockport Quarry Limestone | |||||
---|---|---|---|---|---|
Genus | Species | Presence | Material | Notes | Images |
Clathrodictyidae | [2] | ||||
Idiostromatidae | [2] | ||||
Stromatoporidae | [2] |
Trilobitomorphs
Trilobitomorphs reported from the Rockport Quarry Limestone | |||||
---|---|---|---|---|---|
Genus | Species | Presence | Material | Notes | Images |
Trilobitomorpha | 200 m south of the large sinkhole on the west wall of Rockport Quarry.[2] | ||||
Plants and algae
Plants and algae reported from the Rockport Quarry Limestone | |||||
---|---|---|---|---|---|
Genus | Species | Presence | Material | Notes | Images |
Calcisphera | C. sp. A | "Abandoned quarry of the Onaway Limestone Company on the shore of Black Lake".[2] | |||
C. sp. B | "Abandoned quarry of the Onaway Limestone Company on the shore of Black Lake".[2] | ||||
Rhodophyta | Indeterminate | 200 m south of the large sinkhole on the west wall of Rockport Quarry.[2] | |||
Vermiporella | "Observed as transverse sections, most specimens now irregular in shape due to crushing".[2] |
Cyanophytes
Cyanophytes reported from the Rockport Quarry Limestone | |||||
---|---|---|---|---|---|
Genus | Species | Presence | Material | Notes | Images |
Genus and species indeterminate | Indeterminate | "Spherical bodies 3-5 microns in diameter".[2] | |||
Oncolite | "Some post-depositional crushing of the sample has occurred".[2] | ||||
Renalcis | "Abandoned quarry of the Onaway Limestone Company on the shore of Black Lake".[2] | ||||
Foraminifera
Foraminifera reported from the Rockport Quarry Limestone | |||||
---|---|---|---|---|---|
Genus | Species | Presence | Material | Notes | Images |
Family indet. | "Found sparsely as solitary individuals in 6 specimens".[2] | ||||
Nodosinellidae | [2] | ||||
References
- Stack, Jack; Sallan, Lauren (20 September 2018). "An examination of the Devonian fishes of Michigan". PeerJ. 6 (2): e5636. doi:10.7717/peerj.5636. PMC 6151260. PMID 30258725.
- Cookman, C. W. (1976). "Petrology of the Rockport Quarry Limestone (Middle Devonian Traverse Group) Alpena, Presque Isle and Montmorency Counties, Michigan". S2CID 130419618.
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(help) - Swinehart, Anthony L.; Hoenig, Matthew M. J.; Ginter, Michal (July 2020). "A New Addition to the Devonian Elasmobranch Fauna of Michigan, U.S.A." The American Midland Naturalist. 184 (1): 109–115. doi:10.1637/0003-0031-184.1.109 (inactive 1 August 2023). ISSN 0003-0031.
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: CS1 maint: DOI inactive as of August 2023 (link) - Imbrie, John (1959). "Brachiopods of the Traverse group (Devonian) of Michigan. Part 1, Dalmanellacea, Pentameracea, Strophomenacea, Orthotetacea, Chonetacea, and Productacea. Bulletin of the AMNH ; v. 116, article 4". hdl:2246/1258.
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: Cite journal requires|journal=
(help) - Rogers, Frederick S.; Pitrat, Charles W. (1987). "Distribution of Tylothyris (Brachiopoda) and Its Occurrence in the Traverse Group (Middle Devonian) of Michigan". Journal of Paleontology. 61 (3): 494–507. doi:10.1017/S0022336000028651. ISSN 0022-3360. JSTOR 1305304. S2CID 130922140.
- Kesling, R. V. (1953). "A New Beyrichiid Ostracod from the Middle Devonian Rockport Quarry Limestone of Michigan". S2CID 127104889.
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: Cite journal requires|journal=
(help)
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
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