La Balme, Departement Lot, Midi-Pyrénées, Southern France (Jurassic to of France)

Where: Occitanie, France (44.8° N, 1.6° E: paleocoordinates 34.4° N, 12.5° E)

• coordinate estimated from map

• small collection-level geographic resolution

When: Late/Upper Bajocian to Late/Upper Bajocian (171.6 - 164.7 Ma)

• transition Bajocian/Bathonian; outcrop can be correlated with the Cajarc Formation, more exaxtly with the middle part of the "Calcaires massifs de la Bouye"

• group of beds-level stratigraphic resolution

Environment/lithology: lagoonal or restricted shallow subtidal; lithified limestone and lithified marl

• The fauna indicates a brackish environment in the deposition period. The question remains open as to whether this was a marshy-coast strip receiving fresh-water from time to time, the delta of a river or a lagoon-formation.
• Sequence consists of massive micritic limestone with intercalations (20 cm thick) composed of very fine coal-, clay-, marl-, and limestone-layers. In french literature this type of sediment is often called "Lignit". The samples represent all layers of this lignite.

Size class: macrofossils

Preservation: cast

Primary reference: J. Gründel, T. Pelissie, and M. Guerin. 2000. Brackwasser-Gastropoden des mittleren Doggers von La Balme (Causses du Quercy, Südfrankreich). Berliner geowissenschaftliche Abhandlungen, Reihe E 34:185-203 [M. Aberhan/S. Nurnberg]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 58416: authorized by Martin Aberhan, entered by Sabine Nürnberg on 03.02.2006, edited by Kaitlin Maguire

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Gastropoda
  -
Gastropoda indet. Cuvier 1795 snail
Opercula
 Opisthobranchia -
"Ceritellopsis lycettea" = Ceritella (Ceritellopsis)
"Ceritellopsis lycettea" = Ceritella (Ceritellopsis) snail
 Heterostropha - Planorbidae
Gyraulus balmensis n. sp. snail
Gyraulus sp. Charpentier 1837 snail
 Heterostropha -
Nerineoidea indet. Zittel 1873 snail
 Architaenioglossa - Ampullariidae
? Pictavia sp. Cossmann 1925 apple snail
 Sorbeoconcha - Acteoninidae
"Ovactaeonina sp." = Colostracon (Ovactaeonina) Cossmann 1895 snail
Acteonina sp. d'Orbigny 1850 snail
listed as Actaeonina sp.
? Acteonina sp. d'Orbigny 1850 snail
listed as ?Actaeonina sp.
 Cerithioidea - Cryptaulacidae
 Neritimorpha -
Neritimorpha indet. Golikov and Starobogatov 1975 snail
 Neritoidea - Neritidae
Neritidae indet. Rafinesque 1815 snail
 Neritoidea - Neritariidae
Oncochilus sp. von Zittel 1882 snail
 Neritoidea - Neridomidae
"Neritoma (Neridomus) sp." = Neridomus
"Neritoma (Neridomus) sp." = Neridomus Morris and Lycett 1915 snail
Reptilia
 Saurischia - Titanosauridae
Megaloolithus sp. Mikhailov 1991 titanosaurid
eggshell fragments
 Loricata -
Crocodylia indet. crocodilian
 Testudines -
Testudines indet. Batsch 1788 turtle
 Squamata -
Squamata indet. squamates
Pisces
  -
"Pisces indet." = Osteichthyes
"Pisces indet." = Osteichthyes Huxley 1880 bony fish