Ariunchimeg Yarinpil

• Doctor of geology and mineralogy
• Paleozoic Laboratory Head at Institute of Paleontology and Geology, MAS

The origin of jaws and teeth remains contentious in vertebrate evolution. ‘Placoderms’ (Silurian-Devonian armoured jawed fishes) are central to debates on the origins of these anatomical structures. ‘Acanthothoracids’ are generally considered the most primitive ‘placoderms’. However, they are so far known mainly from disarticulated skeletal element...

In southwestern Mongolia, conodonts from the Indert Formation at its type locality in Shine Jinst were investigated to improve regional and global correlation of the uppermost Devonian-lowermost Carboniferous. The abundance and diversity of the conodont fauna is quite low in general, whereas representatives of Siphonodella, Protognathodus, Pseudopo...

Permineralised stems of Ductoagathoxylon tsaaganensis Cai, Zhang et Feng sp. nov. are described from the Upper Permian strata of the Tsaagan Tolgoy section, South Gobi Basin, Mongolia. The stems were preserved with pith and primary and secondary xylems. The pith is solid, heterocellular, and characterised by regularly arranged clusters of secretory...

The results of a biostratigraphic and lithological studies of the terrigenous Carboniferous Urmugteyul Formation in the stratotype area (left bank of the Sharyn-Gol River, Orkhon Trough) are presented in this research paper. Four members are distinguished in the composition of the formation; the first three members are assigned to the Lower Urmugte...

A Late Devonian to (?)Early Mississippian section at Hushoot Shiveetiin gol in the Baruunhuurai Terrane of the Central Asian Orogenic Belt (CAOB) exposes large parts of cyclic Famennian shallow-water siliciclastic shelf deposits composed of siltstones, sandstones, shales, volcaniclastics, and intercalated autochthonous carbonates. The youngest part...

A Late Devonian to (?)Early Mississippian section at Hushoot Shiveetiin gol in the Baruunhuurai Terrane of the Central Asian Orogenic Belt (CAOB) exposes large parts of cyclic Famennian shallow-water siliciclastic shelf deposits composed of siltstones, sandstones, shales, volcaniclastics, and intercalated autochthonous carbonates. The youngest part...

Endochondral bone is the main internal skeletal tissue of nearly all osteichthyans—the group comprising more than 60,000 living species of bony fishes and tetrapods. Chondrichthyans (sharks and their kin) are the living sister group of osteichthyans and have primarily cartilaginous endoskeletons, long considered the ancestral condition for all jawe...

Endochondral bone is the main internal skeletal tissue of nearly all osteichthyans(1,2)--the group comprising more than 60,000 living species of bony fishes and tetrapods. Chondrichthyans (sharks and their kin) are the living sister group of osteichthyans and have cartilaginous endoskeletons, long considered the ancestral condition for all jawed ve...

Upper Devonian marine deposits of the Baruunhuurai Terrane in western Mongolia represent island arc settings, which yielded a diverse conodont assemblage of 30 taxa, including species of Ancyrognathus (as well as one new species), Icriodus, Mehlina, Polygnathus and Palmatolepis. Biodiversity analysis of Ancyrognathus, Pelekysgnathus, Mehlina and Ic...

Stratigraphic assemblages characteristic for the Ordovician, Silurian, Devonian, Carboniferous, and Permian are presented based on the analysis of newly refined and supplemented data on the composition and distribution of Paleozoic bryozoans in Mongolia. Thirty-four auxiliary biostratigraphic units ranked as beds with bryozoans are established in o...

The taxonomic diversity and distribution of Palaeozoic bryozoans from well-studied Palaeozoic type sections in Mongolia are analysed, and 34 local biostratigraphic units with beds containing bryozoans are established.

IGCP 596 (2011-2015) has a primary focus on climate change and biodiversity patterns in the Mid-Paleozoic (Early Devonian to Late Carboniferous). As a part of this project, we conducted a field workshop in western Mongolia in the summer of 2012. The goal was to locate fossiliferous sections that expose the stage boundaries from the Eifelian / Givet...

Two brachiopod genera, Cancrinella Fredericks and Costatumulus Waterhouse, are studied from the Permian of South Mongolia and South China. Many of the specimens previously described as Cancrinella are revised and assigned to Costatumulus. The new data presented in this paper indicate that these two genera are similar to each other, but are distingu...

In my paper (Ariunchimeg, 1996, p. 70) I described a new genus of Lower Carboniferous bryozoans— Admiranda—from the Visean Stage of southern Mon� golia. In her monograph Mshanki otryada Fenestel� lida, Morozova (2001, p. 77) placed this genus in the family Admiratellidae Morozova, 1992 under the same name. However, that name proved to be preoc� cup...

The taxonomic diversity and distribution of the Upper Ordovician bryozoans of Mongolia are analyzed. Five heterochronous assemblages of bryozoans are established: Chigertei and Tsagaan del in the Sandbian Stage and Bairim Ovoo, Uuregnur, and Sairin in the Katian Stage. The bryozoans are shown to be important for solving complex problems of stratigr...

The Upper Ordovician rocks of Mongolia have yielded bryozoans of the order Rhabdomesida for the first time. These belong to two new species of the genera Ulrichostylus Bassler, 1952 and Nematopora Ulrich, 1888. The same rocks have yielded a new species of the genus Chasmatopora Eichwald, 1855 of the order Phylloporinida. The distribution of these g...

1. Introduction 2. Chronological History of Workers 2.1 Early studies in St Petersburg 2.2 St Petersburg/Leningrad School of Paleobryozoology 2.3 Early studies in Moscow 2.4 Moscow School of Paleobryozoology 3. Acknowledgements

New bryozoan species from the Lower and Middle Carboniferous of Mongolia are described: Leptotrypa rara, Eridotopella tsakhirinnuruensis, Dyscritella gregaria, and Stenophragmidium conspectum from the order Trepostomida and Saffordotaxis germana, S. pulchra, Streblotrypella zagensis, Pseudonematopora sulenkherica, Nemacanthopora costatiformis, and...

The most northerly known Emsian crinoids were located at approximately 45° to 50° N latitude. They are the first Devonian crinoid cups discovered in Mongolia. Specimens are reported from excellent exposures of the informally designated crinoidal beds in the upper part of the stratotype section of the Chuluun Formation, between N44° 22.119', E99° 27...

The Cretaceous sedimentary basins in Mongolia are grouped into three major depositional provinces (Altai, Khangai-Khentei and Gobi) with ten basins (basins of Great Lakes, Valley of Lakes, Arkhangai, Onon, Choir-Nyalga, Choibalsan, Transaltai Gobi, Umnogobi, Dornogobi and Tamsag), which are all filled by continental deposits with abundant vertebrat...

A bryozoan complex characteristic of the Etroeungtian Zone in Western Europe was uncovered in the Samnuur excavation within the Baruunkhurai tectonic zone in southwestern Mongolia. Six species, including a new species Neotrematopora baitagensis, are described.