Samsugns C, in Othem (Silurian of Sweden)

Where: Gotland, Sweden (57.8° N, 18.7° E: paleocoordinates 21.4° S, 2.8° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Ryssnäs Member (Slite Beds Formation), Sheinwoodian (433.4 - 430.5 Ma)

• = Slite Beds, unit C

• group of beds-level stratigraphic resolution

Environment/lithology: deep subtidal ramp; limestone and marl

• SEP: Silurian of Gotland has been variably described as a ramp and platform. Based on my read of the literature, I think if falls best into the ramp category. From Samtleben et al. (1996). Geol. Rundsch 85:278-292; "...this unit consists of a carbonate platform with reef mounds and surrounding shoal sediments of mostly pure biodetritic and pleoidal limestones. Here slow and discontinuous accumulation of carbonate material continued in a very shallow water but under normal marine conditions....to the south and southwest the carbonate platform passes with a conspicuous slope into a deeper shelf basin where a uniform alternation of micritic limestones and marls accumulated." Based on information provided in this collection, it is difficult to tell which facies is represented but I have assumed that it represents the deeper facies.

Size classes: macrofossils, mesofossils

Primary reference: G. Lindström. 1884. The Silurian Gastropoda and Pteropoda of Gotland. Kongliga Svenska Vetenskaps-Akademiens Handlingasr 19:1-250 [P. Wagner/P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 154965: authorized by Pete Wagner, entered by Pete Wagner on 25.03.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

• Most specimens at Riksmuseet.
Gastropoda
 Euomphalina - Helicotomidae
"Trochus wisbyensis" = Boucotspira wisbyensis, "Trochus lamellosus n. sp." = Boucotspira lamellosus
"Trochus wisbyensis" = Boucotspira wisbyensis Lindström 1884 snail
"Trochus lamellosus n. sp." = Boucotspira lamellosus Lindström 1884 snail
 Euomphalina - Euomphalidae
"Oriostoma discors" = Poleumita discors, Poleumita rugosa3, "Pleurotomaria alata" = Euomphalopterus alatus, "Trochus lundgreni" = Hystricoceras lundgreni
"Oriostoma discors" = Poleumita discors Sowerby 1814 snail
Poleumita rugosa3 Sowerby 1814 snail
Oriostoma discors var. rugosa
"Pleurotomaria alata" = Euomphalopterus alatus Wahlenberg 1821 snail
"Trochus lundgreni" = Hystricoceras lundgreni Lindström 1884 snail
 Euomphalina - Elasmonematidae
"Trochus incisus" = Streptotrochus incisus, "Trochus mollis" = Discordichilus mollis
"Trochus incisus" = Streptotrochus incisus Lindström 1884 snail
"Trochus mollis" = Discordichilus mollis Lindström 1884 snail
 Euomphalina - Pseudophoridae
"Trochus profundus n. sp." = Pseudophorus profundus, "Trochus stuxbergi" = Pseudophorus stuxbergi, "Trochus undulans" = Siluriphorus undulans
"Trochus profundus n. sp." = Pseudophorus profundus Lindström 1884 snail
"Trochus stuxbergi" = Pseudophorus stuxbergi Lindström 1884 snail
"Trochus undulans" = Siluriphorus undulans Lindström 1884 snail
 Euomphalina - Holopeidae
"Euomphalus tuba n. sp." = Pachystrophia tuba
"Euomphalus tuba n. sp." = Pachystrophia tuba Lindström 1884 snail
 Euomphalina - Craspedostomatidae
Craspedostoma elegantulum n. sp. Lindström 1884 snail
Craspedostoma filistriatum Lindström 1884 snail
 Euomphalina - Oriostomatidae
Oriostoma leda3 d'Orbigny 1850 snail
 Caenogastropoda - Meekospiridae
"Macrochilina fenestrata n. sp." = Auriptygma fenestrata
"Macrochilina fenestrata n. sp." = Auriptygma fenestrata Lindström 1884 snail
 Murchisoniina - Trochonematidae
"Trochonema turritum" = Globonema turritum
"Trochonema turritum" = Globonema turritum Lindström 1884 snail
 Murchisoniina - Lophospiridae
"Lophospira gothlandica" = Loxoplocus gothlandicus2
"Lophospira gothlandica" = Loxoplocus gothlandicus2 Ulrich and Scofield 1897 snail
 Murchisoniina - Porcelliidae
"Pleurotomaria scutulata" = Quadricarina scutulata
"Pleurotomaria scutulata" = Quadricarina scutulata Lindström 1884 snail
 Murchisoniina - Luciellidae
"Pleurotomaria limata" = Prosolarium limata
"Pleurotomaria limata" = Prosolarium limata Lindström 1884 snail
 Murchisoniina - Phanerotrematidae
"Pleurotomaria othemensis n. sp." = Ulrichospira othemensis
"Pleurotomaria othemensis n. sp." = Ulrichospira othemensis Lindström 1884 snail
 Murchisoniina - Gosseletinidae
"Pleurotomaria aequilatera" = Spiroraphe aequilatera, "Pleurotomaria wisbeyensis" = Pleurorima wisbeyensis, "Pleurotomaria gradata" = Conotoma gradata
"Pleurotomaria aequilatera" = Spiroraphe aequilatera Wahlenberg 1821 snail
"Pleurotomaria wisbeyensis" = Pleurorima wisbeyensis Lindström 1884 snail
"Pleurotomaria gradata" = Conotoma gradata Lindström 1884 snail
 Bellerophontida - Bucaniidae
Megalomphala wilfredi1 Peel 1991 snail