| Article |
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| Article name |
HYPOSTRATOTYPES OF UKUREYSKAYA FORMATION OF NOVOBEREZOVKA AND OLOV DEPRESSIONS OF TRANSBAIKALIA (PART 1. HYPOSTRATOTYPE-1 OF UKUREYSKAYA FORMATION OF NOVOBEREZOVKA DEPRESSION) |
| Authors |
Sinitsa S.. , Reshetova S.. scientific associate, srescht@mail.ruVilmova E.. , |
| Bibliographic description |
Sinitsa S., Reshetova S., Vilmova E. Hypostratotypes of the Ukureyskaya Formation of the Novoberezovska and Olov Depressions of Transbaikalia (Part 1. Hypostratotype-1 of the Ukureyskaya Formation of the Novoberezovska Depression) // Transbaikal State University Journal, 2017, vol. 23, no. 6, pp. 52—62. |
| Category |
Earth science |
| DOI |
[56+551.7]:550.8.528 |
| DOI |
10.21209/2227-9245-2017-23-6-52-62 |
| Article type |
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| Annotation |
Several depressions of Nercha-Kuenga interfluve are composed of tuffaceous sedimentary deposits of Upper Mesozoic which were divided into 6 formations in the fifties of the last century: Olovskaya, Kulindinskaya, Uku- reyskaya, Utanskaya, Kuenginskaya and Soktuyskaya ones. The first four date back to the time of Jurassic, the rest of them — Cretaceous. The relative age was determined tentatively as the organic remains were very rare. Subsequently Kulindinskaya Formation was combined with Ukureyskaya and the stratotype of the last one was worked out according to logs. As drill-hole core was not stored in the region so the stratotype lost its status and a hypostratotype-1 was discovered. This hypostratotype of Ukureyskaya Formation in Novoberezovskaya Depression is more accessible, well exposed and is characterized by diverse fauna and flora. The hypostratotype-lsection is subdivided into three subformations presented by symmetric and asymmetric cyclites: tuff sandstone-tuff silt- stone. Species-indices of Late Jurassic Unda-Daya complex: tadpole shrimps-conchostracan-insects- burrows- plants were found in sediments of lower subformation. The sediments of the middle and upper subformations are mainly characterized by traces of mud-eaters, rare insects and plants. The traces of mud-eaters ferrofibra are the dominants in the sediments of subformations. They are widespread in coeval sediments of the region and point to special habitat conditions and sedimentation on the bottom of the water body: good aeration, plenty of food, comfortable conditions for the formation of precipitation. The sediments of subformations are characterized by special complexes of organic remains and lack common species. A change of ichnogenus according to subformations, bioturbation of sediments by mud-eaters was established, and the correlation with ichnocomplexes of Apsatskaya, Glushkovskaya and other formations of the region was conducted. Wide volcanic lake with levelled-off shores, horsetail marshes, rare forest outliers of marsh Czekanowskia and remote coniferous forest was reconstructed in early ukurey time. From middle ukurey time the addition of volcanic ash was reduced and it completely disappeared by the end of late ukurey time |
| Key words |
Novoberezovskaya Depression; Ukureyskaya Formation; hypostratotype-1; Unda-Daya complex; Late Jurassic; ichnogenera; Transbaikalia; Zyulzinskaya basin; Nercha-Kuenga interfluve; Kulindinskaya formation |
| Article information |
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| References |
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| Full article | HYPOSTRATOTYPES OF UKUREYSKAYA FORMATION OF NOVOBEREZOVKA AND OLOV DEPRESSIONS OF TRANSBAIKALIA (PART 1. HYPOSTRATOTYPE-1 OF UKUREYSKAYA FORMATION OF NOVOBEREZOVKA DEPRESSION) |
