Macknight Bjerg Quarry (Triassic of Greenland)

Also known as area V, Jameson Land

Where: East Greenland, Greenland (71.4° N, 22.6° W: paleocoordinates 45.4° N, 2.0° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Ørsted Dal Member (Fleming Fjord Formation), Norian (228.0 - 208.5 Ma)

• from the lower part of the informal "Carlsberg Fjord beds" of the Ørsted Dal member; this part of the sequences appears to late Norian according to Clemmensen et al. (1998, PPP, 140:135, fig. 3)

• group of beds-level stratigraphic resolution

Environment/lithology: lacustrine - small; red, blue, silty, conglomeratic claystone and sandstone

• "shallow or ephemeral lake influenced by predominant winds from the NNE."
• member composed of "cyclic, bedded claystones or silty claystones and thin sandstones. This unit is also characterized by a well-developed composite cyclicity...The dominant facies in the cycles is red or violet claystone, or silty claystone with horizontal lamination. Commonly violet claystones are overlain by more silty, redbrown claystones. These claystones contain sandstone laminae, thin paleosols, and some infraformational conglomerates with bone fragments...The sandstones...are characterized by small-scale, wave-formed or current-formed cross-lamination and more rarely large-scale, current-formed cross-lamination. Upper bedding planes frequently contain dessication features, wave ripple marks, and dinosaur tracks."

Size class: macrofossils

Collected in 1991–1992; reposited in the MCZ

Collection methods: quarrying, mechanical,

Primary reference: F. A. Jenkins, N. H. Shubin, W. W. Amaral, S. M. Gatesy, C. R. Schaff, L. B. Clemmensen, W. R. Downs, A. R. Davidson, N. Bonde and F. Osbaeck. 1994. Late Triassic continental vertebrates and depositional environments of the Fleming Fjord Formation, Jameson Land, East Greenland. Meddelelser om Grønland, Geoscience 32:1-25 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 26995: authorized by Matthew Carrano, entered by Matthew Carrano on 11.11.2002, edited by Richard Butler and Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

Chondrichthyes
 Hybodontiformes - Hybodontidae
Hybodontidae indet. Agassiz 1843 elasmobranch
Actinopteri
 Saurichthyiformes - Saurichthyidae
Saurichthys sp. Agassiz 1843
Osteichthyes
 Dipnoi -
Dipnoi indet. Müller 1884 lungfish
Coelacanthimorpha
 Actinistia -
"Actinistia indet." = Coelacanthimorpha
"Actinistia indet." = Coelacanthimorpha lobe-finned fish
Osteichthyes
 Temnospondyli - Plagiosauridae
Gerrothorax pulcherrimus1 Fraas 1913 tetrapod
6 skeletons and more than 35 variously complete skulls
 Temnospondyli - Cyclotosauridae
Cyclotosaurus naraserluki n. sp.3 Marzola et al. 2017 tetrapod
MGUH.VP 9522 (MCZ field no. 15/92G), one large skull, smaller skull roof, jaws, centra and limb elements
Reptilia
 Pterosauria -
"Eudimorphodon cromptonellus" = Arcticodactylus cromptonellus2
"Eudimorphodon cromptonellus" = Arcticodactylus cromptonellus2 Jenkins et al. 2001 pterosaur
MCZ field no. 13/91G
 Eosuchia -
? Lepidosauromorpha indet.2 Benton 1983 crown diapsid
Partial postcranial skeleton and lower jaws