Elmo, MCZ 1935 collection Lower Limestone (Permian of the United States)

Where: Kansas (38.6° N, 97.2° W: paleocoordinates 3.6° N, 25.8° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Wellington Formation, Artinskian (290.1 - 279.3 Ma)

• Stratigraphy is essentially the same as other Elmo collections except for new upper layer of non extensive limestone. The floor of the quarry where fossils taken is the "Stump layer", resting upon this floor is the white, blocky limestone from which the other collection of insects were taken. In the new quarry the blocky layer is surmounted by about two inches of soft calcareous shale, which in turn is overlain by another blocky layer of limestone. New layer can not be more than 60 feet in diameter. Above this new layer is the shaly limestone found elsewhere in the field. Upper layer thins laterally and pinches out within 20 feet of edge of new quarry.

• group of beds-level stratigraphic resolution

Environment/lithology: pond; lithified, lenticular limestone

• Presence of Myalinella may suggest brackish-marine conditions, but stratigraphic position and presence of conchostracans and freshwater ostracods suggest a lacustrine/pond setting.

Size classes: macrofossils, mesofossils

Preservation: mold/impression

Collected by F.M. Carpenter in 1935; reposited in the MCZ

Collection methods: quarrying,

Primary reference: F. M. Carpenter. 1939. The Lower Permian Insects of Kansas. Part 8: Additional Megasecoptera, Protodonata, Odonata, Homoptera, Psocoptera, Protelytroptera, Plectoptera and Protoperlaria. Proceedings of the American Academy of Arts and Sciences 73(3):29-70 [C. Labandeira/C. Labandeira/J. Karr]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 114152: authorized by Matthew Clapham, entered by Matthew Clapham on 11.08.2011

Creative Commons license: CC BY (attribution)

Taxonomic list

Insecta
 Diaphanopterodea - Asthenohymenidae
Asthenohymen dunbari Tillyard 1924 winged insect
Asthenohymen pusillus Tillyard 1926 winged insect
 Megasecoptera - Protohymenidae
Permohymen schucherti Tillyard 1924 winged insect
Protohymen permianus Tillyard 1924 winged insect
Protohymen tenuis n. sp. Carpenter 1939 winged insect
 Protelytroptera - Protelytridae
Protelytron permianum Tillyard 1931 winged insect
Protelytron furcatum Carpenter 1939 winged insect
 Protelytroptera - Permelytridae
Parablattelytron elongatum Tillyard 1931 winged insect
Parablattelytron rectum Tillyard 1931 winged insect
 Grylloblattodea - Lemmatophoridae
Lecorium elongatum Sellards 1909 ice crawler
Lemmatophora typa Sellards 1909 ice crawler
Artinska ovata Sellards 1909 ice crawler
Artinska clara Sellards 1909 ice crawler
Lisca minuta Sellards 1909 ice crawler
 Caloneurodea -
Paleuthygramma acuta n. sp. Carpenter 1943 winged insect
 Miomoptera - Palaeomanteidae
"Delopterum latum" = Delopsocus latus
"Delopterum latum" = Delopsocus latus Sellards 1909 winged insect
 Permopsocida - Permopsocidae
Permopsocus latipennis Tillyard 1926 winged insect
 Hemiptera - Archescytinidae
Permopsylla americana Tillyard 1926 true bug
Permopsylla minuta Carpenter 1931 true bug
 Ephemerida - Protereismatidae
Protereisma insigne Tillyard 1932 mayfly