Lower Silurian conodonts from the Shine Jinst region, southwestern Mongolia

被引:2
作者
Danielsen, Erika M. [1 ,2 ]
Over, D. Jeffrey [1 ]
机构
[1] SUNY Coll Geneseo, Dept Geol Sci, Geneseo, NY 14454 USA
[2] Univ Iowa, Dept Earth & Environm Sci, Iowa City, IA 52242 USA
关键词
NEW-SOUTH-WALES; LATE ORDOVICIAN; CARNIC ALPS; INTEGRATED BIOSTRATIGRAPHY; MULTIELEMENT CONODONTS; DEVONIAN CONODONTS; GOBI ALTAI; AGE; LLANDOVERY; LIMESTONE;
D O I
10.1017/jpa.2016.18
中图分类号
Q91 [古生物学];
学科分类号
0709 ; 070903 ;
摘要
Lower Silurian conodonts were recovered from carbonate beds in the upper Zalaa and lower Sharchuluut formations at Yamaan Us in the Shine Jinst region, Gobi-Altai Zone, of southwestern Mongolia. Conodonts are described from the Zalaa Formation for the first time; key taxa recovered include Distomodus kentuckyensis Branson and Branson, 1947, Ozarkodina hassi (Pollock, Rexroad, and Nicoll, 1970), Pranognathus siluricus (Pollock, Rexroad, and Nicoll, 1970), and Pseudolonchodina expansa (Armstrong, 1990). These species constrain the onset of the Silurian carbonate platform, upper Zalaa to lower Sharchuluut formations, to the Pranognathus tenuis Zone, middle Aeronian. The presence of a cosmopolitan conodont fauna places these strata from the Gobi-Altai Zone in a basin-shelf marine setting with connection and circulation to the open ocean during the Llandovery.
引用
收藏
页码:78 / 91
页数:14
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