S-D localities 9-11, northwestern Thailand (Silurian to of Thailand)

Where: Thailand (19.3° N, 97.9° E: paleocoordinates 1.1° S, 139.6° E)

• coordinate based on nearby landmark

• basin-level geographic resolution

When: Ludlow to Ludlow (427.4 - 393.3 Ma)

• "...biostratigraphical position cannot be determined exactly; it ranges from Silurian, resp. Late Ludlovian, to Emsian..."

Environment/lithology: basinal (); shale and limestone

• "The Silurian and Early Devonian rock sequence of Northern Thailand was formed in an area of marine sedimentation extending from Malaysia, Burma, and Thailand to Southern China, probably not surpassing 200 m in thickness. Whereas the Silurian mainly consists of fine clastics with local chert and limestone intercalations, the Lower Devonian is characterized by prevailing cherts, graptolite bearing black shales, limestones and minor amounts of sandy material. Due to complicated tectonics and thick vegetation so far continuous sections of these strata have not been spotted in Thailand." [NB localities 1, 2, and 13 are in western rather than northern Thailand, but it seems to be implied that these deposits are geologically related to those in the northwest.]

•SEP environmental call based on given info

• "..a mostly clastic series with minor limestone-intercalations. W of the longitude Mae Sariang-Mae Hong Son, this sequence becomes prevailingly calcareous. The limestones yielded assemblages of conodonts and orthoceratids at several localities. The conodonts are the only fossils of biostratigraphical values whereas the orthoceratids are too badly preserved for any determination."

Primary reference: H. Bastin, E. von Braun, A. Hess, K.-E. Koch, V. Stein, D. Stoppel, and R. Wolfart. 1977. Thailand. In A. Martinsson (ed.), The Silurian-Devonian boundary (IUGS, Series A, Number 5) 238-244 [M. Foote/M. Foote/M. Uhen]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 13992: authorized by Michael Foote, entered by Michael Foote on 07.05.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

• "...only the biostratigraphically most important species are mentioned..."
Show authors, comments, and common names
unclassified
  -
Oneodontus beckmanni
Oneodontus beckmanni
genus name in quotes
Conodonta
 Ozarkodinida -
Hindeodella equidentata, "Spathognathodus steinhornensis" = Ozarkodina steinhornensis, Ozarkodina typica
Hindeodella equidentata Rhodes 1953 conodont
"Spathognathodus steinhornensis" = Ozarkodina steinhornensis Ziegler 1956 conodont
subsp. cf. eosteinhornensis
Ozarkodina typica Branson and Mehl 1933 conodont
 Ozarkodinida - Spathognathodontodae
"Spathognathodus inclinatus" = Wurmiella excavata
"Spathognathodus inclinatus" = Wurmiella excavata Branson and Mehl 1933 conodont
 Belodellida - Belodellidae
Belodella triangularis