Isle La Motte, Lake Champlain, Crown Point Formation (Ordovician of the United States)

Also known as Reef 1814

Where: Vermont (44.9° N, 73.3° W: paleocoordinates 28.0° S, 54.6° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Crown Point Formation (Chazy Group), Chazy (466.0 - 457.5 Ma)

• Late Chazyan

• group of beds-level stratigraphic resolution

Environment/lithology: reef, buildup or bioherm; lithified lime mudstone

• mounds about 15 to 30 m long, 10 m wide, and 1 to 3 m high
• mounds of carbonate mud; mounds are surrounded by bedded calcarenite

Size classes: macrofossils, mesofossils

Collection methods: peel or thin section,

• The dominant species in any mound is either a stromatoporoid, an alga (Solenopora) or a bryozoan (Batostoma).

Primary reference: U. S. Kapp. 1975. Paleoecology of Middle Ordovician stromatoporoid mounds in Vermont. Lethaia 8:195-207 [W. Kiessling/U. Merkel]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 63297: authorized by Wolfgang Kiessling, entered by Uta Merkel on 10.08.2006, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

Trilobita
  -
Trilobita indet. Walch 1771 trilobite
Deuteropoda
  -
Ostracoda indet. Latreille 1802 ostracod
Brachiopoda
  -
Brachiopoda indet. Cuvier 1805
Stenolaemata
 Cystoporata - Ceramoporidae
Cheiloporella sp. Ulrich 1882
 Cryptostomata -
 Trepostomata -
Trepostomata indet. Ulrich 1882
 Trepostomata - Trematoporidae
Cephalopoda
 Nautiloidea -
Nautiloidea indet. Agassiz 1847 nautiloid
Gastropoda
 Bellerophontida - Bucaniidae
Bucania sulcatina2 Emmons 1842 snail
 Bellerophontida - Sinuitidae
Trigyra ulrichi n. gen. n. sp.2
Trigyra ulrichi n. gen. n. sp.2 Raymond 1908 snail
 Euomphalina - Raphistomatidae
Raphistoma stamineum2 Hall 1847 snail
 Euomphalina - Macluritidae
Maclurites magnus Le Sueur 1818 snail
 Murchisoniina - Lophospiridae
"Lophospira seelyi n. sp." = Lophospira milleri2
"Lophospira seelyi n. sp." = Lophospira milleri2 Miller 1877 snail
Paragastropoda
 Mimospirida - Clisospiridae
Clisospira bassleri n. sp.2 Raymond 1908
Anthozoa
 Sarcinulida - Billingsariidae
Billingsaria parva tabulate coral
Demospongiae
 Lithistida - Anthaspidellidae
Zittelella sp. Ulrich and Everett 1889 demosponge
Anthaspidella sp. Ulrich and Everett 1889 demosponge
Stromatoporoidea
 Labechiida - Labechiidae
Labechia eatoni1 stromatoporoid sponge
Labechia cf. pustulosa1 stromatoporoid sponge
Labechia valcourensis1 stromatoporoid sponge
Labechia prima1 Kapp and Stearn 1975 stromatoporoid sponge
 Labechiida - Rosenellidae
Pachystylostroma vallum n. sp.1 stromatoporoid sponge
Pachystylostroma goodsellense n. sp.1 stromatoporoid sponge
Pachystylostroma pollicellum n. sp.1 stromatoporoid sponge
Pseudostylodictyon lamottense1 stromatoporoid sponge
Sphaerocodium
  -
Sphaerocodium sp. Rothpletz 1890
Rhodophyceae
  - Solenoporaceae