From Wikipedia, the free encyclopedia
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]
Fossil content
Color key
Notes Uncertain or tentative taxa are in small text ; crossed out taxa are discredited.
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
Placoderms
Invertebrates
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
Crustaceans
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
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]
See also
References
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r 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 .
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x Cookman, C. W. (1976). "Petrology of the Rockport Quarry Limestone (Middle Devonian Traverse Group) Alpena, Presque Isle and Montmorency Counties, Michigan".
S2CID
130419618 .
^
a
b 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 31 January 2024).
ISSN
0003-0031 . {{
cite journal }}
: CS1 maint: DOI inactive as of January 2024 (
link )
^
a
b
c
d
e
f
g
h 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 .
^
a
b 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 .