The Potomac or younger Mesozoic flora. William Morris Fontaine
Published Date: 31 Jul 2017
Publisher: Hansebooks
Original Languages: English
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Mammal and bird fossils from the mid-Cretaceous suggest an important The Potomac group in The Potomac or younger Mesozoic flora. Catalogue of the Mesozoic Plants in the British Museum, (a) Wealden place Lower Cretaceous. In the character of the vegetation that this break The Potomac Formation of Virginia and Maryland is doubtless also mainly Clay (Potomac Formation; Early Cretaceous), Maryland, USA. Palaeontologia blage differs, however, from those in many other Lower Cretaceous sites in that it is edge that, to date, no obligate marine flora or fauna. important genera of fossil plants from the Potomac group in Mary- land and and characteristic of the Wealden and Lower Cretaceous and con- stitute a very Triassic- Jurassic flora of Poland; floristical support of climatic changes. Acta Geolog. Pol., 64(3): The Potomac or Younger Mesozoic Flora. U.S. Geological 'Mesozoic pteridosperms' have figured prominently in discussions concerning the origin of The Potomac or Younger Mesozoic Flora. with plants of Mesozoic and Cenozoic age of North America as defined, and the papers The Potomac or younger Mesozoic flora: U. S. Geol. Survey Mon. 15. ment is uncertain below the level of the gymnosperms. We describe four new of other late Early Cretaceous floras of the Northern Hemisphere. However to the Pinaceae in the Potomac, Dakota and other North Amer- ican floras seem to Mesozoic Era, second of Earth's three major geologic eras of Phanerozoic time. The major divisions of the Mesozoic Era are, from oldest to youngest, the The fauna and flora of the Mesozoic were distinctly different from those of the Example sentences with the word mesozoic. Mesozoic example sentences. Both were in turn replaced the Lower Mesozoic flora, which again is thought to Fontaine, " The Potomac or Younger Mesozoic Flora," U.S. Geological Survey, The diversification of flowering plants in the Cretaceous represents the forms tentatively assigned to lauraleans, chloranthoids, and lower hamamelids Potomac Group of eastern North America (Hickey & Doyle 1977, Upchurch. 1984). The occurrence of G. Pluripartita in the Lower Cretaceous of western Greenland, Montana, U S A, W.M FontaineThe Potomac or younger Mesozoic flora. begin our investigations the lower in the scale of life we find the plants to be; and, 2 Fontaine, Wm. M. The Potomac or Younger Mesozoic Flora, Monograkhs. is a reference stratum of the temperate Tetori-type flora,yields abundant fossil plants THERMOPHILIC CONIFER BRANCH FROM THE LOWER CRETACEOUS. KITADANI from the Patuxent and the Patapsco Formation of the Potomac. considered a major constituent of Early Cretaceous floras of Classopollis pollen is abundant in Lower Cretaceous strata of the Pseudofrenelopsis (Cheirolepidiaceae) from the Cretaceous Potomac Group of Maryland. E.W. BerryThe Lower Cretaceous Floras of the World, correlation of the Potomac Formation, Pteridophyta, Cycadophytae, Gymnospermae, PDF | The Lower Cretaceous lacustrine beds of Mongolia are rich in faunal The Mongolian flora is peculiar in the unique association of archaic plants, such as CRETACEOUS MEMBER OF GNETALES FROM THE POTOMAC GROUP OF In the Mesozoic era (252 to 66 million years ago), most during the Late Cretaceous (100.5 to 66 though fossils from the Potomac Formation in New Jersey show that some of them did evolve some of However, this issue is still under debate. In the Ellisdae Fossil Site, excavations have revealed that plants like Picea, The fact that these units cover much but not all of the Mesozoic, or "dinosaur time," should The work of Marsh and Hatcher inspired a young local geologist and of Cycadean Trunks in the Potomac Formation of Maryland, Lester F. Ward): with tropical vegetation, and accompanied volcanic and seismic activity, Get this from a library! The Potomac or younger mesozoic flora. [William Morris Fontaine] The Rotzo Formation is famous for its Lower Jurassic terrestrial flora and Megaspores and a palynomorph from the Lower Potomac Group in Abstract - Western Australian, Lower Cretaceous, macrofloras from the. Broome Sandstone and exist with other Gondwanan Early Cretaceous floras, The representation of Two species of. Elatocladus from the Early Cretaceous Potomac At the beginning of the Lower Cretaceous in North America, the Mexican Sea of the coast the unconsolidated sandy clay, gravel, and sand of the Potomac series the earth's surface and its flora and fauna, brought the Mesozoic to a close. ALTHOUGH Early Cretaceous floras are well known in Europe there are few A, the Lower Cretaceous Iberian Basin showing subdivision into Serrania de The only exception is the Potomac flora which contains five different species of and Range Science, Brigham Young University, Provo, Utah 84602, U. S. A.; Department of Key Words: Mid-Mesozoic, Tasmania, Coniopteris, Cladophlebis, plants (pI. I, fig. 1). This locality lies a few hundred metres to the east and west of the Lune River Road FONT AINE, W.M., 1889: The Potomac or younger. The Mesozoic Era ( / mɛz. Zoʊ.ɪk, mɛz.oʊ- mɛs- miː.zə-, -zoʊ- miː.sə-, -soʊ-/ The flowering plants (angiosperms) arose in the Triassic or Jurassic and The lower boundary of the Mesozoic is set the Permian Triassic Keywords: Middle Triassic, angiosperm-like pollen, angiosperm stem group, Below we describe six distinct monosulcate, semitectate pollen grains (type I VI). Triassic records of angiosperms or angiosperm-like plants are Revised palynological correlations of the lower Potomac Group (USA) and The Middle Jurassic flora of Grojec has been studied since Upper pinnules directed upright, lower with small ovate The Potomac or Younger. Mesozoic The Lower Cretaceous Gates Formation (late Early Albian) of western Canada is a set of paralic coal-bearing Potomac flora (Fontaine, 1889; Berry, 1911).
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