Eyam Limestone

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Eyam Limestone
Ma
[1]
Eyam Limestone in Wirksworth
TypeGeological formation
Unit ofPeak Limestone Group
UnderliesLongstone Mudstone Formation
OverliesMonsal Dale Limestone Formation
AreaDerbyshire
Thickness9 to 54 m[2]
Lithology
PrimaryLimestone
Location
Region England
Country United Kingdom
ExtentPeak District
Type section
Named forEyam

The Eyam Limestone (formerly known as the Cawdor Group, Cawdor Limestone or Eyam Group) is a

period, and represents a marine environment.[2]

Depositional environment

At the time of deposition, Britain was just south of the

xenacanth Bransonella has been suggested to imply freshwater influence as xenacanths live mainly in freshwater habitats, however its presence in other marine formations suggests that Bransonella was a marine animal unlike its relatives.[1]

phosphatic overgrowths are present on some conodont elements from the formation. As phosphatogenesis only occurs in the anoxic-oxic boundary while apatite precipitation occurs in the top few centimeters of the sediment column, this reveals that shallow sediment with low geothermal temperatures and dysoxic conditions were present in the Eyam Limestone.[1][4]

Fossil content

Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon
Ootaxon
Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Cartilaginous fish

Cartilaginous fish
reported from the Eyam Limestone
Genus Species Presence Material Notes Images
Acanthorhachis A. cf. spinatus Steeplehouse Quarry.[1] Basal body & spines.[1] A listracanthid.
Anachronistes
 		A. fordi Steeplehouse Quarry.[5] Teeth.[5]
Junior synonym of Cooleyella
.
Bransonella B. nebraskensis Steeplehouse Quarry & Cawdor Quarry.[1][6] Teeth.[1][6] A
xenacanth
.
Carcharopsis C. prototypus Steeplehouse Quarry & Coleshill Quarry.[1][7] Teeth.[1][7] A
squatinactiform
.
Cladodus C. sp. Steeplehouse Quarry.[1] 4 teeth.[1] A cladoselachid.
Cooleyella C. fordi Steeplehouse Quarry & Cawdor Quarry.[1][5][6] Teeth.[1][5][6] An anachronistid.
"Ctenacanthus" "C." costellatus Steeplehouse Quarry.[1] Partial tooth.[1] A
ctenacanth
.
Ctenoptychius C. lobatus Steeplehouse Quarry.[1] 3 teeth.[1] A
petalodont
.
Cypripediodens C. cristatus Once-a-week Quarry.[8] Teeth.[8] A
petalodont
.
Denaea D. cf. fournieri Steeplehouse Quarry & Cawdor Quarry.[1][6] Teeth.[1][6] A
falcatid
.
Euchondrocephali
gen. et. sp. indet. 		Indeterminate Cawdor Quarry.[6] Teeth.[6] Somewhat similar to orodontid teeth.
Euselachii
gen. et. sp. indet. 		Indeterminate Cawdor Quarry.[6] Tooth.[6] An indeterminate
euselachian
.
Ginteria G. fungiforma Cawdor Quarry.[6] Teeth.[6] An anachronistid.
Lissodus L. wirksworthensis Teeth.[9] Reassigned to the genus Reesodus.
Petalorhynchus P. psittacinus Steeplehouse Quarry.[1] Crown & smaller tooth fragment.[1] A
petalodont
.
Petrodus P. patelliformis Steeplehouse Quarry.[1] Thousands of
dermal denticles.[1]
 A symmoriid and the most abundant vertebrate in the formation.
Reesodus R. wirksworthensis Steeplehouse Quarry.[1] Tooth.[1] A
hybodont
.
Saivodus S. striatus Steeplehouse Quarry.[1] Tooth.[1] A
ctenacanth
.
Squatinactis S. caudispinatus Cawdor Quarry.[6] 4 teeth.[6] A
squatinactiform
.
Thrinacodus T. dziki Steeplehouse Quarry & Cawdor Quarry.[1][6] Teeth.[1][6] A phoebodont.

Conodonts

Conodonts reported from the Eyam Limestone
Genus Species Presence Material Notes Images
Gnathodus G. girtyi Steeplehouse Quarry.[1] Partial S element.[1] An idiognathodontid.
?Hindeodus ?H. sp. Steeplehouse Quarry.[1] P1 element fragment.[1] An anchignathodontid.
?Idioprioniodus ?I. sp. Steeplehouse Quarry.[1] Two P1 element fragments.[1] A prioniodinid.
Kladognathus K. sp. Steeplehouse Quarry.[1] M element.[1] A coelodontid.
Lochriea L. commutata Steeplehouse Quarry.[1] Two P1 elements.[1] A spathognathodontid.
L. mononodosa Steeplehouse Quarry.[1] P1 element.[1] A spathognathodontid.
L. sp. Steeplehouse Quarry.[1] Two P2 elements.[1] A spathognathodontid.

Invertebrates

Arthropods

Arthropods reported from the Eyam Limestone
Genus Species Presence Material Notes Images
Cummingella C. cf. carringtonensis Monyash.[10] A phillipsiid trilobite.
C. sampsoni Stoney Middleton & near Hassop.[11] Multiple specimens.[11] A phillipsiid trilobite.
C. cf. tuberculingenata Monyash.[10] A phillipsiid trilobite.
Griffithides G. whitewatsoni Stoney Middleton.[11] Multiple specimens.[11] A proetid trilobite.

Brachiopods

Brachiopods reported from the Eyam Limestone
Genus Species Presence Material Notes Images
Acanthoplecta A. mesoloba Monyash.[10] A
productid
.
Alitaria A.? panderi Monyash.[10] A
productid
.
A. sp. Monyash.[10] A
productid
.
Antiquatonia A. hindi Monyash.[10] A
productid
.
A. cf. hindi Monyash.[10] A
productid
.
A. cf. insculpta Monyash.[10] A
productid
.
A. sulcata Monyash.[10] A
productid
.
A. sp. Monyash.[10] A
productid
.
Avonia A. aculeata Monyash.[10] A
productid
.
A. davidsoni Monyash.[10] A
productid
.
A. youngiana Monyash.[10] A
productid
.
A. cf. youngiana Monyash.[10] A
productid
.
A. sp. Monyash.[10] A
productid
.
Brachythyris B. ovalis Monyash.[10] A
spiriferid
.
B. cf. ovalis Monyash.[10] A
spiriferid
.
Buxtonia B. sp. Monyash.[10] A
productid
.
Coledium C. sp. Monyash.[10] A
rhynchonellid
.
Dictyoclostus
 		D. sp. Monyash.[10] A
productid
.
Echinoconchus E. punctatus Monyash.[10] A
productid
.
E. subelegans Monyash.[10] A
productid
.
Eomarginifera E. cf. lobata Monyash.[10] A
productid
.
E. longispinus Monyash.[10] A
productid
.
Fluctuaria F. undata Monyash.[10] A
productid
.
Fusella F. sp. Monyash.[10] A
spiriferid
.
Girtyella G. sacculus Monyash.[10] A terebratulid.
Hustedia H. ulothrix Monyash.[10] An athyridid.
Kochiproductus K. sp. Monyash.[10] A
productid
.
Krotovia K. spinulosa Monyash.[10] A
productid
.
Linoproductoidea indet. Indeterminate Monyash.[10] A
productid
.
Linoprotonia L. sp. Monyash.[10] A
productid
.
Marginicinctus M. sp. Monyash.[10] A
productid
.
Marginiferoidea indet. Indeterminate Monyash.[10] A
productid
.
Martinia M. sp. Monyash.[10] A
spiriferid
.
Orthoidea indet. Indeterminate Monyash.[10] An orthid.
Overtonia O. fimbriata Monyash.[10] A
productid
.
Pleuropugnoides P. pleurodon Monyash.[10] A rhynchonellid.
P. sp. Monyash.[10] A rhynchonellid.
Productina P. margaritacaea Monyash.[10] A
productid
.
P. sp. Monyash.[10] A
productid
.
Productus
 		P. productus Monyash.[10] A
productid
.
P. sp. Monyash.[10] A
productid
.
Pugilis P. cf. pugilis Monyash.[10] A
productid
.
P. sp. Monyash.[10] A
productid
.
Pugnax P. acuminatus Monyash.[10] A
rhynchonellid
.
P.cordiformis Monyash.[10] A
rhynchonellid
.
P. pseudopugnus Monyash.[10] A
rhynchonellid
.
P. cf. pugnoides Monyash.[10] A
rhynchonellid
.
P. sp. Monyash.[10] A
rhynchonellid
.
Pustula P. sp. Monyash.[10] A
productid
.
Rugosochonetes R. sp. Monyash.[10] A
productid
.
Schizophoria S. resupinata Monyash.[10] An orthid.
S. sp. Monyash.[10] An orthid.
Sinuatella S. cf. sinuata Monyash.[10] A
productid
.
S. sp. Monyash.[10] A
productid
.
Spirifer S. bisulcatus Monyash.[10] A
spiriferid
.
S. cf. bisulcatus Monyash.[10] A
spiriferid
.
S. planicostus Monyash.[10] A
spiriferid
.
S. triangularis Monyash.[10] A
spiriferid
.
Spiriferoidea indet. Indeterminate Monyash.[10] A
spiriferid
.

Bryozoans

Bryozoans reported from the Eyam Limestone
Genus Species Presence Material Notes Images
Fenestelloidea Indeterminate Monyash.[10]

Cnidarians

Cnidarians reported from the Eyam Limestone
Genus Species Presence Material Notes Images
Diphyphyllum D. sp. Monyash.[10] A
horn coral
.

Echinoderms

Echinoderms reported from the Eyam Limestone
Genus Species Presence Material Notes Images
Crinoidea
indet. 		Indeterminate Monyash.[10]

Molluscs

Molluscs
reported from the Eyam Limestone
Genus Species Presence Material Notes Images
Aviculopecten A. interstitialis Monyash.[10] A
bivalve
.
Aviculopinna A. mutica Monyash.[10] A pinnid bivalve.
Bivalvia indet. Indeterminate Monyash.[10] A
bivalve
.
Conocardium C. sp. Monyash.[10] A
rostroconch
.
Girtypecten G. stellaris Monyash.[10] A
bivalve
.
Leiopteria L. sp. Monyash.[10] A
bivalve
.
Parallelodon P. sp. Monyash.[10] A parallelodontid bivalve.
Pinna P. flabelliformis Monyash.[10] A pinnid bivalve.

See also

References

  1. ^
    ISSN 0016-7878
    .
  2. ^ a b "BGS Lexicon of Named Rock Units - Result Details". webapps.bgs.ac.uk. Retrieved 1 September 2023.
  3. S2CID 130499005
    .
  4. S2CID 140725466
    .
  5. ^ a b c d Duffin, Christopher; Ward, David (1 January 1983). "Neoselachian sharks' teeth from the Lower Carboniferous of Britain and the Lower Permian of the USA". Palaeontology.
  6. ^
    doi:10.4202/app.00084.2014
    .
  7. ^ a b Cuny, Gilles (1 January 2008). "Carcharopsis prototypus and the adaptations of single crystallite enameloid in cutting dentitions". Acta Geologica Polonica.
  8. ^
    doi:10.1016/j.pgeola.2017.06.008
    .
  9. S2CID 233061921
    .
  10. ^
    ISSN 0044-0604
    .
  11. ^
    ISSN 0044-0604
    .
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