The Late Cretaceous flora of the Khatanga depression

Palaeobotany ◽  
2012 ◽  
Vol 3 ◽  
pp. 32-61 ◽  
Author(s):  
L. B. Golovneva
Keyword(s):  
Late Cretaceous ◽  
Temperate Climate ◽  
Common Elements ◽  
Fossil Plants ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Characteristic Features ◽  
Water Plants ◽  
Warm Temperate ◽  
Cretaceous Deposits

Fossil plants from the Late Cretaceous deposits of the Khatanga depression are joined in three floristic assemblages: the Ledyanaya assemblage (the Turonian-Coniacian), the Kheta assemblage (the late Coniacian-early Santonian) and Mutino assemblage (the late Santonian-early Campanian). The Ledyanaya floristic assemblage contains ferns (Anemia rarinervis Abramova), cycadophytes (Nilssonia sp.), ginkgoales (Ginkgo ex gr. sibirica Heer), conifers (Taxodium sp., Sequoia tenuifolia (Schmalh.) Sveshn. et Budants.) and angiosperms (Pseudoprotophyllum hatangaense Abramova, Liriodendropsis simplex (Newb.) Newb., Trochodendroides sp., ะกissites sp., Dicotylophyllum sp.). The characteristic features of this assemblage are depauperated composition of angiosperms and survival of the Early Cretaceous relic elements. The Kheta floristic assemblage contains only Taxodium sp. and Trochodendroides sp. The Mutino floristic assemblage contains Sequoia tenuifolia, Pseudoprotophyllum hatangaense, Quereuxia angulata (Newb.) Krysht. ex Baik. and Cobbania corrugata (Lesq.) Stockey, Rothwell et Johnson. The Ledyanaya floristic assemblage is very similar with the Newsiberian flora from the Derevyannye Gory Formation of New Siberia Island. The Mutino floristic assemblage have common elements with Kundur flora (the Campanian) from the Kundur Formation of Amur region. The abundance of large leaves of Pseudoprotophyllum in the Mutino flora is evidence of the preservation of humid warm-temperate climate in the northern part of Siberia up to the Campanian. The presence of water plants Quereuxia angulata and Cobbania corrugada indicates the westward migration of some characteristic elements of the Pacific ocean lowlands.

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.

Late Cretaceous and Tertiary aporrhaid gastropods from the southern rim of the Pacific Ocean

1995 ◽  
Vol 69 (4) ◽  
pp. 692-702 ◽  
Author(s):  
William J. Zinsmeister ◽  
Miguel Griffin
Keyword(s):  
New Species ◽  
New Zealand ◽  
South America ◽  
Late Cretaceous ◽  
Late Eocene ◽  
Southern South America ◽  
Early Tertiary ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Early Cenozoic

The new subfamily Struthiopterinae is proposed for the aporrhaid gastropods occurring in the Late Cretaceous-early Tertiary Weddellian Province along the southern margin of the Pacific. The following genera are placed within the Struthiopterinae: Struthioptera Finlay and Marwick, 1937; Austroaporrhais n. gen.; and Struthiochenopus n. gen. The temporal and biogeographic distribution of members of Struthiopterinae show a similar pattern to other Southern Hemisphere groups of Late Cretaceous and early Cenozoic molluscs with initial disappearance from the western Australasia of the Weddellian Province by the Paleocene while surviving in Antarctica until the late Eocene and eventually disappearing in southern South America during the early Miocene.Also included in this paper is a reappraisal of the species assignable to these genera from Late Cretaceous and early Tertiary of New Zealand, Antarctica, and southern South America together with the description of five new species. The following new species of the Struthiopterinae are described: Austroaporrhais larseni n. sp., A. stilwelli n. sp., A. dorotensis n. sp., Struthiochenopus antarcticus n. sp., and S. philippii n. sp.

scholarly journals The Late Cretaceous to recent tectonic history of the Pacific Ocean basin

2016 ◽  
Vol 154 ◽  
pp. 138-173 ◽  
Author(s):  
Nicky M. Wright ◽  
Maria Seton ◽  
Simon E. Williams ◽  
R. Dietmar Müller
Keyword(s):  
Pacific Ocean ◽  
Late Cretaceous ◽  
Ocean Basin ◽  
Tectonic History ◽  
The Pacific ◽  
History Of ◽  
The Pacific Ocean

Late Cretaceous-early Tertiary gastropods from southwestern Patagonia, Argentina

1994 ◽  
Vol 68 (2) ◽  
pp. 257-274 ◽  
Author(s):  
Miguel Griffin ◽  
Mario A. Hünicken
Keyword(s):  
New Zealand ◽  
Pacific Ocean ◽  
Late Cretaceous ◽  
Shallow Sea ◽  
Santa Cruz ◽  
Continuous Sequence ◽  
Early Tertiary ◽  
The Pacific ◽  
Molluscan Fauna ◽  
The Pacific Ocean

The continuous sequence of Maastrichtian to Paleocene sediments exposed in the Sierra Dorotea area in southwestern Santa Cruz (Argentina) contains a rich molluscan fauna with many elements characteristic of the Weddellian Faunistic Province. The presence in this fauna of genera such as Taioma, Heteroterma, Fyfea, Zemacies, and Priscaphander suggests close affinities with faunas of similar age from New Zealand, further supporting the existence of continuous shallow-sea conditions along the southern margin of the Pacific Ocean during the end of the Cretaceous and beginning of the Tertiary. In this paper 25 species are described, of which six are new: Pseudofax costellatus n. sp., Taioma patagonica n. sp., Heteroterma elegans n. sp., Fyfea beui n. sp., Priscaphander sanjosensis n. sp., and Priscaphander bracaccinii n. sp.

A new asteroid (Echinodermata) faunule from the Early Cretaceous (Barremian) of Morocco

2011 ◽  
Vol 85 (6) ◽  
pp. 1021-1034 ◽  
Author(s):  
Daniel B. Blake ◽  
Roland Reboul
Keyword(s):  
New Species ◽  
Early Cretaceous ◽  
Late Cretaceous ◽  
Deep Water ◽  
Small Specimen ◽  
Northwest Africa ◽  
The Pacific ◽  
The Family ◽  
Morphologic Evolution ◽  
The Pacific Ocean

An asteroid (Echinodermata) faunule of four taxa representing three surviving families and a probable fourth is described from the Barremian (Early Cretaceous) of Morocco, northwest Africa. The four together suggest limited morphologic evolution since the Cretaceous but biogeographic and depth patterns have changed. Marocaster coronatus n. gen. n. sp. (Valvatida, Goniasteridae) combines apparent derived features of the dorsal disk and superomarginal shape with more stemward expressions of the abactinal ossicles. Betelgeusia orientalis n. sp. is a fourth Mesozoic occurrence of the Radiasteridae (Paxillosida), the new species similar to earlier occurrences from the Middle Jurassic of India, the Early Cretaceous of Texas, and the Late Cretaceous of Europe. Reported modern occurrences of the family are few, widely scattered, and limited to deeper water; the extinct species together testify to a once-broader familial distribution. Dipsacaster africanus n. sp., a member of the Astropectinidae (Paxillosida), is remarkably similar to extant congeners. Dipsacaster today is widely distributed in the Pacific Ocean but occurrences in the Atlantic are few. Because of preservation, a single small specimen of the Zoroasteridae? (Forcipulatida) cannot be identified with certainty. Extant zoroasterids are deep-water in distribution, although shallow-water Eocene representatives are known.

scholarly journals The first record of a trionychid turtle (Testudines: Trionychidae) from the Cretaceous of the Pacific Coast of North America

2018 ◽  
Vol 5 ◽  
Author(s):  
Matthew J. Vavrek ◽  
Donald B. Brinkman
Keyword(s):  
British Columbia ◽  
North America ◽  
Late Cretaceous ◽  
Rocky Mountains ◽  
Pacific Coast ◽  
First Record ◽  
Vancouver Island ◽  
The Pacific ◽  
Western Interior Basin ◽  
Cretaceous Deposits

Trionychid turtles were widespread throughout much of the Western Interior Basin of North America during the Cretaceous, represented by a wide variety of taxa. Despite their widespread abundance east of the Rocky Mountains, they have not previously been reported from Cretaceous deposits along the Pacific Coast of North America. We report here on an isolated trionychid costal from Vancouver Island, British Columbia. The fossil was recovered from the Late Cretaceous (Turonian to Maastrichtian) Nanaimo Group, on Vancouver Island, British Columbia. While the fossil is generically indeterminate, its presence adds an important datapoint in the biogeographic distribution of Trionychidae.  

IV.—Oceanic ‘Deeps’

1908 ◽  
Vol 5 (1) ◽  
pp. 19-20
Author(s):  
T. Mellard Reade
Keyword(s):  
Pacific Ocean ◽  
Earth Structure ◽  
Sea Bottom ◽  
The Pacific ◽  
The Pacific Ocean ◽  
Characteristic Features ◽  
Probable Origin

One of the most characteristic features of the great oceans is the presence of what have been aptly termed ‘deeps,’ enormous depressions in the ocean bottoms. Having in my “Evolution of Earth Structure” discussed their distribution and probable origin, I was naturally attracted by the notice in Nature of the surveys of the vessel “Edi” and the cable-ship “Stephan” during 1903 and 1905 in the western and south-western parts of the Pacific Ocean. Drs. G. Shott and P. Perlewitz, in a paper recently issued in the Archiv der deutschen Seewarte, taking into consideration previous work by U.S. ship “Hero” and of the German vessel “Planet,” consider that these soundings throw a great deal of new light on the configuration of the sea bottom in those regions. They state that the troughs forming the deeps are usually about 10 miles wide, excepeting the Guam deep, which is as much as 20 across. The most interesting statement to me is that in their opinion the troughs are the result of subsidence occurring on an enormous scale along lines of fracture, and that is probable the disturbances which produced these structures are comparatively recent.

scholarly journals New data on the late cretaceous flora of the New Siberia island, New Siberian Islands

2019 ◽  
Vol 27 (3) ◽  
pp. 53-69
Author(s):  
A. B. Herman ◽  
V. V. Kostyleva ◽  
P. A. Nikolskii ◽  
A. E. Basilyan ◽  
A. E. Kotel’nikov
Keyword(s):  
Late Cretaceous ◽  
Taxonomic Diversity ◽  
Time Interval ◽  
Fossil Plants ◽  
New Siberian Islands ◽  
Humid Climate ◽  
Plant Fossils ◽  
Angiosperm Species ◽  
Warm Temperate

New plant fossils collected in 2016 from the Derevyannye Gory Formation on the New Siberia Island are studied. Thirty species of fossil plants are identified and illustrated. They belong to liverworts, ferns, ginkgoaleans, conifers and angiosperms. Sixteen of them have not beed found in the New Siberia Flora before. A new angiosperm species Dalembia (?) gracilis Herman is described. The New Siberia Flora is characterised by a moderately high taxonomic diversity, predominance of conifers and angiosperms with large-leafed platanoids and trochodendroids being the most abundant among angiosperms, by predominance of dentate-margined angiosperms and rarity of plants with entire-margined leaves, and by absence of cycadaleans and bennettitaleans. The flora existed during the Turonian–Coniacian time interval and most probably should be dated as Turonian. Plants of the New Siberia Flora experienced a warm-temperate humid climate with warm summers, mild frost-free winters and insignificant seasonality in precipitation.

Large fossil birds from a Late Cretaceous marine turbidite sequence on Hornby Island (British Columbia)

2011 ◽  
Vol 48 (11) ◽  
pp. 1489-1496 ◽  
Author(s):  
Gareth Dyke ◽  
Xia Wang ◽  
Gary Kaiser
Keyword(s):  
British Columbia ◽  
Pacific Ocean ◽  
Late Cretaceous ◽  
Deep Water ◽  
Fossil Birds ◽  
Size Classes ◽  
Eastern Margin ◽  
The Pacific ◽  
The Pacific Ocean

Few fossil birds and non-avian dinosaurs are known from Mesozoic sediments bordering the eastern margin of the Pacific Ocean. Here, we describe additional remains of Late Cretaceous birds from a deep-water marine turbidite sequence of the Northumberland Formation exposed on Hornby Island, British Columbia. The bones described here are referable (based on hypothesized autapomorphies) to the Cretaceous avian lineages Enantiornithes and Ornithurae and fall into at least two size classes within either lineage. This suggests the presence of multiple taxa occurring within the Northumberland Formation.

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