La Pouza farmhouse (Jurassic of France)

Where: Auvergne-Rhône-Alpes, France (44.8° N, 4.8° E: paleocoordinates 34.8° N, 15.0° E)

• coordinate estimated from map

• small collection-level geographic resolution

When: Zigzag ammonoid zone, Early/Lower Bathonian (167.7 - 164.7 Ma)

• 3 beds (LaP1, LaP2, LaP3)

• group of beds-level stratigraphic resolution

Environment/lithology: slope or ramp reef; poorly lithified marl and gray, muddy limestone

• "A number of the echinoderm fragments are abraded, suggesting accumulation in a high-energy environment. The debris is concentrated in the basal part of the clay beds, and becomes progressively sparser into the higher part of each bed. The alternating marl-limestone couplets appear to represent background sedimentation in relatively deep water, perhaps reflecting climatically driven cycles, with a low background input of calcitic detritus from shallower environments, probably washed downslope by storms. The four graded beds containing abundant echinoderm material represent substantial, brief, input from a shallower environment, perhaps generated by major storm events or slope instability." "a steep slope at a depth of about 150 m"
• "Lower Bathonian marls and marly limestones containing siliceous sponges and brachiopods." "crinoidal limestones are surmounted by grey limestones and marlstone (‘‘Calcaires gris de la Pouza’’) of Early Bathonian age (Zigzag Zone)"

Size class: macrofossils

Collected by H. Hess & A.S. Gale in 1950s & 2010

• Natural History Museum Basel (Switzerland). Hess collected here in 1950s and Gale collected 100 kg of echinoderm-rich marl in 2010

Primary reference: H. Hess. 2012. Crinoids from the Middle Jurassic (Bajocian–Lower Callovian) of Arde`che, France. Swiss Journal of Palaeontology 131:121-253 [P. Novack-Gottshall/P. Novack-Gottshall]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 225715: authorized by Phil Novack-Gottshall, entered by Phil Novack-Gottshall on 25.05.2022

Creative Commons license: CC BY (attribution)

Taxonomic list

Asteroidea
  -
Asteroidea indet. de Blainville 1830 sea star
Echinoidea
  -
Echinoidea indet. Leske 1778 sea urchin
Scattered fragments
Crinoidea
 Millericrinida - Apiocrinitidae
Apiocrinites sp. Miller 1821 Sea lily
1 pluricolumnal, 14 columnals
 Cladida - Cyclocrinidae
Cyclocrinus rugosus d'Orbigny 1841 Sea lily
1 pluricolumnal, 18 columnals
 Comatulida - Paracomatulidae
Singillatimetra inordinata n. gen. n. sp. Hess 2012 Feather star
 Comatulida - Solanocrinitidae
Solanocrinites voultensis n. sp. Hess 2012 Feather star
Palaeocomaster messingi n. sp. Hess 2012 Feather star
Andymetra galei n. gen. n. sp. Hess 2012 Feather star
 Isocrinida - Isocrinidae
Balanocrinus dumortieri de Loriol 1887 Sea lily
9 pluricolumnals, 11 columnals
Balanocrinus inornatus d'Orbigny 1850 Sea lily
Balanocrinus pacomei de Loriol 1887 Sea lily
1 columnal
Isocrinus dumortieri Oppel 1865 Sea lily
Isocrinus nicoleti Desor 1845 Sea lily
1 pluricolumnal
 Cyrtocrinida - Eudesicrinidae
Dolichocrinus aberrans de Loriol 1882 Sea lily
8 cups
 Cyrtocrinida - Tetracrinidae
Praetetracrinus bathonicus n. sp. Hess 2012 Sea lily
 Cyrtocrinida - Phyllocrinidae
Phyllocrinus colloti de Loriol 1882 Sea lily
1 cup
Phyllocrinus voultensis n. sp. Hess 2012 Sea lily
1 cup
 Cyrtocrinida - Sclerocrinidae
Cyrtocrinus praenutans n. sp. Hess 2012 Sea lily
347 cups plus columnals, attachment discs, and brachials
 Cyrtocrinida - Eugeniacrinitidae
Lonchocrinus dumortieri de Loriol 1882 Sea lily
5 cups, 1 s primibrachial
Bivalvia
 Pectinida -
"Limacea indet." = Limoidea
"Limacea indet." = Limoidea Rafinesque 1815 scallop