Late Cretaceous Kholokhovchan floral assemblage of the Okhotsk-Chukotka volcanogenic belt (North-Eastern Asia)

Palaeobotany ◽  
2013 ◽  
Vol 4 ◽  
pp. 116-147 ◽  
Author(s):  
S. V. Shczepetov ◽  
A. B. Herman
Keyword(s):  
Late Cretaceous ◽  
Eastern Asia ◽  
Plant Fossils ◽  
Volcanogenic Belt ◽  
North Eastern ◽  
Volcanogenic Deposits ◽  
Floral Assemblage ◽  
Eastern Russia ◽  
Comprehensive Study

Results of comprehensive study of the Kholokhovchan floral assemblage collection is summarized. These plant fossils were collected in 1978 by E. L. Lebedev from volcanogenic deposits in Penzhina and Oklan rivers interfluve, North-Eastern Russia. This assemblage was previously known as a list of Lebedev’s preliminary identifi cations only. He had suggested that the Kholokhovchan assemblage is correlative to the latest Albian — early Turonian Grebenka flora from the Anadyr River middle reaches. However, our study demonstrates that the Kholokhovchan assemblage is most similar to the presumably the Turonian-Coniacian Arman flora of the Okhotsk-Chukotka volcanogenic belt and, therefore, should be dated as the Turonian-Coniacian or Turonian.

scholarly journals On the Likely Palaeoelevation of the Turonian – Coniacian Arman Flora Site (North-Eastern Asia)

2018 ◽  
Vol 74 (1-2) ◽  
pp. 159-164 ◽  
Author(s):  
Alexei B. Herman
Keyword(s):  
Late Cretaceous ◽  
Coastal Plain ◽  
Temperate Climate ◽  
Eastern Asia ◽  
North Eastern ◽  
Warm Temperate ◽  
Analytical Errors ◽  
High Diversity ◽  
Eastern Russia ◽  
Dicot Species

The Turonian - Coniacian (Late Cretaceous) Arman Flora (North-eastern Russia, Magadan District) exhibits a high diversity of fossil angiosperms (28 dicot species). Based on their physiognomy, palaeoclimate variables were estimated showing that the flora experienced a humid warm-temperate climate without any pronounced seasonality. Palaeoclimate variables estimated for the coastal plain floras (Penzhina, Kaivayam and Tylpegyrgynai floras, North-eastern Russia) are the same (within analytical errors) as those estimated for the Arman Flora that existed within uplands of the Okhotsk-Chukotka volcanogenic belt. This conclusion implies that the elevation of the intermontane basin of the Arman Flora biotope was not high, presumably not more than 600 m - and not sufficient to be reflected in palaeoclimate experienced by the Arman Flora.

Ginkgophytes of the Ul’ya flora (the Ul’ya depresiion, the Okhotsk-Chukotka volcanogenic belt)

Palaeobotany ◽  
2016 ◽  
Vol 7 ◽  
pp. 80-95 ◽  
Author(s):  
L. B. Golovneva
Keyword(s):  
New Species ◽  
Early Cretaceous ◽  
Late Cretaceous ◽  
Middle Part ◽  
Leaf Length ◽  
Volcanogenic Belt ◽  
Short Shoots ◽  
Volcanogenic Deposits

The Ul’ya flora comes from the Coniacian volcanogenic deposits of the Amka Formation (the Ul'ya depression, southern part of the Okhotsk-Chukotka volcanogenic belt). Ginkgoaleans are diverse in this flora and represented by three genera: Ginkgo, Sphenobaiera and Baiera. All specimens have no cuticle and were assigned to morphotaxa. Genus Ginkgo includes two species: G. ex gr. adiantoides (Ung.) Heer with entire leaves and G. ex gr. sibirica Heer with dissected leaves. Genus Sphenobaiera also consists of two species: S. ex gr. longifolia (Pom.) Florin with 4–8 leaf lobes and S. ex gr. biloba Prynada with two leaf lobes. Genus Baiera is represented by new species B. lebedevii Golovn., sp. nov.Leaves of this species are 25–30 cm long and 13–16 cm wide, narrowly wedge-shaped with flat slender petiole, dichotomously dissected 4–5 times into linear segments 3–6 mm wide with 6–12 veins. The length of ultimate segments is equal to about a half of leaf length. Leaves attached spirally to ovoid short shoots about 2 cm long. Among the Late Cretaceous floras similar diversity of ginkgoaleans was recorded only in the Turonian-Coniacian Arman flora from middle part of the Okhotsk-Chukotka volcanogenic belt (Herman et al., 2016). Four species of ginkgoaleans from the Ul’ya flora (except G. ex gr. adiantoides) are considered as the Early Cretaceous relicts.

The late cretaceous flora from volcanogenic deposits of northern Priokhotie (The Okhotsk-Chukotka volcanogenic belt)

Palaeobotany ◽  
2010 ◽  
Vol 1 ◽  
pp. 45-95 ◽  
Author(s):  
S. V. Shczepetov ◽  
L. B. Golovneva
Keyword(s):  
New Species ◽  
Late Cretaceous ◽  
Fossil Plants ◽  
Main Species ◽  
Systematic Description ◽  
Volcanogenic Belt ◽  
The Common ◽  
Volcanogenic Deposits

Assemblage of fossil plants from the Gydra, Yum and Kananyga Formations (the Villigha and Toomahni Rivers interfluve, Okhotsk-Chukotka volcanogenic belt) are joined in the Aleeki flora. The systematic description of main species is given and floristic and phytostratigraphical analysis of this flora is carried out. New species Lobifolia alikensis Golovn. et Shczep. is described. The Aleeki flora is typical flora of the Okhotsk-Chukotka volcanogenic belt. It contain few angiosperms and significant amount relic elements among ferns (Hausmannia, Lobifolia), cycadophytes (Heilungia), czekanowskiales (Phoenicopsis) and ginkgoales (Sphenobaiera, Ginkgo ex gr. sibirica). In consequence of its stratigraphical position the Aliky flora is slightly younger than the Chingandzha flora (the Turonian-Coniacian) and it is compositionally similar with the Chaun flora (Coniacian). On this basis the age of the Aleeki flora is estimated as the Coniacian. The common taxa of the Aleeki and Chingandzha floras are Coniopteris tschuktschorum, Asplenium dicksonianum, Cladophlebis inaequipinnulata, Birisia sp., Ginkgo ex gr. adiantoides, G. ex gr. sibirica, Sequoia, Metasequoia, Menispermites, Dalembia and Trochodendroides. The common genera of the Aleeki and Chaun floras are Coniopteris, Asplenium, Arctopteris, Cladophlebis, Ginkgo, Sphenobaiera, Heilungia, Phoenicopsis, Picea, Sequoia, Metasequoia, Menispermites, Dalembia and Trochodendroides. Besides that the Aleeki flora contains some species, which were believed as endemic of the Chaun flora: Tchaunia lobifolia, Cladophlebis grandis and Araucarites subacutensis. The Aleeki and Chaun floras are now considered as contemporaneous regional floras, which were distributed in the northern part of the Okhotsk-Chukotka volcanogenic belt.

The late cretaceous flora from volcanogenic deposits of Northern Priokhotie (The Okhotsk-Chukotka volcanogenic belt)

Palaeobotany ◽  
2011 ◽  
Vol 2 ◽  
pp. 100-113 ◽  
Author(s):  
L. B. Golovneva ◽  
S. V. Shczepetov
Keyword(s):  
Late Cretaceous ◽  
Fine Grained ◽  
Lacustrine Deposits ◽  
Volcanogenic Belt ◽  
Volcanogenic Deposits ◽  
Systematic Composition

The Karamken floristic assemblage occurs from basal layers of the Kholchan Formation of the Okchotsk-Chukotka volcanogenic belt (OCVB). The locality is situated at Khasyn River near Karamken settlement. The Karamken assemblage is composed of 6 taxa: Heilungia sp., Phoenicopsis ex gr. angustifolia Heer, Sphenobaiera sp., Metasequoia sp., Taxodium amguemensis (Efimova) Golovn., Trochodendroides sp. This flora is distinct from more ancient Arman flora and younger Ola flora. According to systematic composition the Karamken floristic assemblage is similar to the Chaun flora of Central Chukotka (the Coniacian), to the Aleeki flora from the Villigha and Toomahni Rivers interfluve (the Coniacian) and to the floristic assemblage from the Leurvaam (?) Formation of Eastern Chukotka (Efimova, 1966). On this basis the age of the Karamken flora is estimated as the Coniacian. Association of the remains of Metasequoia, Taxodium amguemensis, Phoenicopsis and large leaves of Sphenobaiera is repeated in different localities in different part of the OCVB. These remains are usually connected with fine-grained volcanogenic-terrigenous paludal-lacustrine deposits.

The Gedan floristic assemblage from the Late Cretaceous deposits of the Kholchan Formation of the Okhotsk-Chukotka volcanogenic belt

Palaeobotany ◽  
2014 ◽  
Vol 5 ◽  
pp. 73-93 ◽  
Author(s):  
L. B. Golovneva ◽  
S. V. Shczepetov
Keyword(s):  
River Basin ◽  
Late Cretaceous ◽  
Middle Part ◽  
Isotopic Data ◽  
Volcanogenic Belt ◽  
Stratigraphic Position ◽  
Cretaceous Deposits

The Gedan floristic assemblage occurs from upper layers of the Kholchan Formation of the Okchotsk-Chukotka volcanogenic belt (OCVB). The locality is situated at the Gedan River in the middle part of the Arman River basin. The Gedan assemblage is composed of 6 taxa: Cladophlebis sp., Sphenobaiera sp., Ginkgo ex gr. adiantoides (Ung.) Heer, Taxodium amguemensis (Efimova) Golovn., Metasequoia sp., Pagiophyllum sp. The similarity of the Gedan floristic assemblage with the Karamken and the Khirumki floristic assemblages from the Kholchan Formation of the Okhotsk sector of the OCVB allows us to join them in the Kholchan flora. This flora is distinct from more ancient Arman flora, which dated as the Turonian-Coniacian and from younger Ola flora, which dated as the Santonian-early Campanian. The age of the Kholchan flora is estimated as the Coniacian on the basis of stratigraphic position, presence of Podozamites, Metasequoia and Quereuxia and also isotopic data. This flora is equivalent with the Chaun flora of Central Chukotka, with the Aleeki flora from the Villigha and Toomahni Rivers interfluve and with the Ulya flora from the southern part of the Okhotsk-Chukotka volcanogenic belt.

Geomagnetic investigations in the north-eastern Russia

2011 ◽  
Vol 3 (5) ◽  
pp. 1-8 ◽  
Author(s):  
A. V. Moiseyev ◽  
G. A. Makarov ◽  
N. I. Neustroyev
Keyword(s):  
The North ◽  
North Eastern ◽  
Eastern Russia

scholarly journals A Review of Recently Discovered Remains of the Pleistocene Branchiopods (Anostraca, Notostraca) from NE Siberia and Arctic Canada

Water ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 280
Author(s):  
D. Christopher Rogers ◽  
Anton A. Zharov ◽  
Anna N. Neretina ◽  
Svetlana A. Kuzmina ◽  
Alexey A. Kotov
Keyword(s):  
Western North America ◽  
Temporary Wetlands ◽  
Indicator Organisms ◽  
Aquatic Habitats ◽  
Eastern Asia ◽  
Large Mammal ◽  
Large Branchiopods ◽  
North Eastern ◽  
North Western ◽  
Large Branchiopod

In this study, we examine, identify, and discuss fossil remains of large branchiopod crustaceans collected from six sites across the Beringian region (north-eastern Asia and north-western North America). Eggs and mandibles from Anostraca and Notostraca, as well as a notostracan telson fragment and a possible notostracan second maxilla, were collected from both paleosediment samples and also from large mammal hair. The remains of large branchiopods and other species that are limited to seasonally astatic aquatic habitats (temporary wetlands) could be useful indicator organisms of paleoecological conditions. Different recent large branchiopod species have very different ecological preferences, with each species limited to specific geochemical component tolerance ranges regarding various salinity, cation, and gypsum concentrations. Our purpose is to bring the potential usefulness of these common fossil organisms to the attention of paleoecologists.

scholarly journals Adocus Kohaku, A New Species of Aquatic Turtle (Testudines: Cryptodira: Adocidae) from the Late Cretaceous of Kuji, Iwate Prefecture, Northeast Japan, with Special References to the Geological Age of the Tamagawa Formation (Kuji Group) LSID urn:lsid:zoobank.org:act:61376EEE-A386-416E-98AE-FF64FE2597A2

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Ren Hirayama
Keyword(s):  
New Species ◽  
Late Cretaceous ◽  
Morphological Diversity ◽  
Eastern Asia ◽  
Geological Age ◽  
Iwate Prefecture ◽  
A New Species

A nearly complete shell of the genus Adocus (Adocidae; Pan-Trionychia; Cryptodira; Testudines) was collected from the late Cretaceous (Turonian) Tamagawa Formation of Kuji Group at Kuji City, Iwate Prefecture, northeast Japan. This turtle shows unique features such as the loss of cervical scute, extreme expansion of marginal scutes overlying costal plates, and exclusion of the humeral- pectoral sulcus from entoplastron. Thus, A. kohaku is erected as a new species. As A. kohaku shows most derived position of A. kohaku within this genus, morphological diversity of the genus Adocus seems to have occurred rather early in its evolution in Eastern Asia.

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