Fossil plants from the Vysokorechenskaya Formation (the Upper Cretaceous, Korayk Upland)

Palaeobotany ◽  
2015 ◽  
Vol 6 ◽  
pp. 36-47 ◽  
Author(s):  
L. B. Golovneva ◽  
A. A. Gnilovskaya
Keyword(s):  
River Basin ◽  
Upper Cretaceous ◽  
Fossil Plants ◽  
Southeastern Part ◽  
Terrigenous Sediments ◽  
Systematic Composition ◽  
Koryak Upland ◽  
Upper Maastrichtian

The Vysokorechensk floristic assemblage comes from the Vysokorechenskaya Formation (Khatyrka and Svetlaya Rivers interfluve, southeastern part of the Korayk Upland). It contains 12 species: Equisetum sp., Sphenopteris sp., Ginkgo ex gr. adiantoides (Heer) Unger, Elatocladus smittiana (Heer) Seward, Mesocyparis beringiana (Golovn.) McIver et Aulenback, Sequoia sp., Тaxodium sp., Сelastrinites septentrionalis (Krysht.) Golovn., Corylus sp., Peculnea sp., Platanus sp. Trochodendroides sp. According to systematic composition the Vysokorechensk floristic assemblage is similar to the Kakanaut flora from the Kakanaut Formation (Kakanaut River Basin). The Vysokorechenskaya Formation is represented by marine volcanogenous-terrigenous sediments. It contains inocerams and ammonites of the upper Maastrichtian (Schachmaticeramus kusiroensis (Nagao et Mat.), Pachydiscus subcompressus Mat.). On this base the age of the Vysokorechensk floristic assemblage is determined as the beginning of late Maastrichtian. The correlation of the Maastrichtian deposits of diff erent areas of eastern part of the Koryak Upland was carried out.

New data about the Late Cretaceous floras of the Ulya depression (western coast of Sea of Okhotsk)

Palaeobotany ◽  
2013 ◽  
Vol 4 ◽  
pp. 148-167 ◽  
Author(s):  
L. B. Golovneva
Keyword(s):  
River Basin ◽  
Early Cretaceous ◽  
Late Cretaceous ◽  
Sea Of Okhotsk ◽  
Northeastern Russia ◽  
Western Coast ◽  
Fossil Plants ◽  
Sedimentary Deposits ◽  
Volcanogenic Belt ◽  
Systematic Composition

New investigation of fossil plants from volcanic-sedimentary deposits of the Amka Formation in Ulya River basin (southern part of the Okhotsk-Chukotka volcanogenic belt, Northeastern Russia) shows, that the Arinda, Uenma, Ust-Amka and Gyrbykan floristic assemblages from diff erent localities of this formation have very close systematic composition. We propose to joint these assemblages in the single regional flora, which is named the Ulya flora. The Ulya flora consists of almost 40 species. The majority of them are represented by new undescribed taxa. In this flora gymnosperms (Phoenicopsis ex gr. speciosa Heer, Ginkgo ex gr. adiantoides (Ung.) Heer, G. ex gr. sibirica Heer, Sphenobaiera sp., Podozamites sp., Elatocladus spp., Araucarites sp., Sequoia sp., Metasequoia sp., Cupressinocladus sp., Ditaxocladus sp., Pityophyllum sp., Pityostrobus sp.) predominate. Ferns (Asplenium dicksonianum Heer, Arctopteris sp., Cladophlebis spp. and several undescribed taxa) and angiosperms (Trochodendroides spp., undetermined Platanaceae, Dicotylophyllum spp., Quereuxia angulate (Newb.) Krysht. ex Baik.) are not abundant. This flora is characterized by presence of the Early Cretaceous relicts (Phoenicopsis, Sphenobaiera and Podozamites), by rarity of angiosperms and by high endemism. On the base of comparison of the Ulya flora with other floras from middle and northern parts of the Okhotsk-Chukotka volcanogenic belt, the age of the Ulya flora is estimated as the Coniacian.

The Envymaam floristic assemblage from the Upper Cretaceous deposits of the Okhotsk-Chukotka volcanogenic belt

Palaeobotany ◽  
2014 ◽  
Vol 5 ◽  
pp. 42-59 ◽  
Author(s):  
L. B. Golovneva ◽  
S. V. Shczepetov
Keyword(s):  
River Basin ◽  
Early Cretaceous ◽  
Upper Cretaceous ◽  
Isotopic Data ◽  
Basaltic Rocks ◽  
Volcanogenic Belt ◽  
The Poor ◽  
Palynological Assemblages ◽  
Systematic Composition ◽  
Cretaceous Deposits

The Envymaam floristic assemblage occurs from basaltic rocks of the Envymaam Formation in the Envymaam River basin, Central Chukotka segment of the Okhotsk-Chukotka volcanogenic belt. This assemblage consists of 18 taxa: Hepaticites sp., Coniopteris tschuktschorum (Krysht.) Samyl., Phoenicopsis ex gr. angustifolia Heer, Cupressinocladus enmyvaamensis Golovn., sp. nov., Araliaephyllum philippoviae Golovn., sp. nov. Among them, two species are fi rstly described. The Envymaam assemblage is characterized by presence of the Early Cretaceous relicts (Phoenicopsis), by rarity of angiosperms and by small sizes of their leaves. Age of the Envymaam floristic assemblage is determined as the late Campanian on the basis of systematic composition, palynological, paleomagnetic and isotopic data. Direct continuity between the Envymaam and the Ust’-Emuneret floristic assemblages from the subjacent Emuneret Formation it isn’t observed that is caused probably by the poor composition of the Envymaam floristic assemblage. Palynological assemblages from the Envymaam, Ust’-Emuneret, Ola and Arkagala Formations are very similar.

The Chingandzha flora of the Okhotsk-Chukotka volcanic belt

Palaeobotany ◽  
2019 ◽  
Vol 10 ◽  
pp. 13-179
Author(s):  
L. B. Golovneva
Keyword(s):  
River Basin ◽  
Volcanic Belt ◽  
Flowering Plants ◽  
Sedimentary Deposits ◽  
North East ◽  
The North ◽  
Magadan Region ◽  
Chukotka Volcanic Belt ◽  
Systematic Composition ◽  
Coastal Lowlands

The Chingandzha flora comes from the volcanic-sedimentary deposits of the Chingandzha Formation (the Okhotsk-Chukotka volcanic belt, North-East of Russia). The main localities of the Chingandzha flora are situated in the Omsukchan district of the Magadan Region: on the Tap River (basin of the middle course of the Viliga River), on the Kananyga River, near the mouth of the Rond Creek, and in the middle reaches of the Chingandzha River (basin of the Tumany River). The Chingandzha flora includes 23 genera and 33 species. Two new species (Taxodium viligense Golovn. and Cupressinocladus shelikhovii Golovn.) are described, and two new combinations (Arctopteris ochotica (Samyl.) Golovn. and Dalembia kryshtofovichii (Samyl.) Golovn.) are created. The Chingandzha flora consists of liverworts, horsetails, ferns, seed ferns, ginkgoaleans, conifers, and angiosperms. The main genera are Arctop teris, Osmunda, Coniopteris, Cladophlebis, Ginkgo, Sagenoptepis, Sequoia, Taxodium, Metasequoia, Cupressinocladus, Protophyllocladus, Pseudoprotophyllum, Trochodendroides, Dalembia, Menispermites, Araliaephyllum, Quereuxia. The Chingandzha flora is distinct from other floras of the Okhotsk-Chukotka volcanic belt (OCVB) in predominance of flowering plants and in absence of the Early Cretaceous relicts such as Podozamites, Phoenicopsis and cycadophytes. According to its systematic composition and palaeoecological features, the Chingandzha flora is similar to the Coniacian Kaivayam and Tylpegyrgynay floras of the North-East of Russia, which were distributed at coastal lowlands east of the mountain ridges of the OCVB. Therefore, the age of the Chingandzha flora is determined as the Coniacian. This flora is assigned to the Kaivayam phase of the flora evolution and to the Anadyr Province of the Siberian-Canadian floristic realm. The Chingandzha flora is correlated with the Coniacian Aleeky flora from the Viliga-Tumany interfluve area and with other Coniacian floras of the OCVB: the Chaun flora of the Central Chukotka, the Kholchan flora of the Magadan Region and the Ul’ya flora of the Ul’ya Depression.

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