lower cretaceous

Listing 1 - 10 from 18 for lower cretaceous

UMass Amherst: Biology Department -> Faculty -> James W. Walker
... electron microscopy of the earliest known fossil angiosperm pollen grains from rocks of the Lower Cretaceous. More recently, I have been interested in studies of the pollen of primitive lilialean ... Ferguson, eds., Academic Press. Walker, J.W. and A.G. Walker. 1984. Ultrastructure of Lower Cretaceous angiosperm pollen and the origin and early evolution of flowering plants. Ann. Missouri Bot. ...
www.bio.umass.edu

Maryland Geological Survey: Astrodon johnstoni: the Maryland State Dinosaur
... . Hatcher soon found what would become the richest dinosaur fossil site ever found in the Lower Cretaceous of the East Coast--the Arundel Clay in the area between Beltsville and Muirkirk in ...
www.mgs.md.gov

Maryland Geological Survey:
... ancient Maryland landscape from the Late Triassic (228 million years ago) to the Late Cretaceous (70 mya). Maryland's climate and topography during this 158 million year period varied ... era, between the Triassic and Cretaceous periods. Most of the specimens are found in the Arundel Clay (Lower Cretaceous), the Severn and Mt. Laurel Formations (Upper Cretaceous), and the Gettysburg Shale (Upper ...
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The Palynology Group. The Micropalaeontological Society - TMS
... and teaching courses in palynology and for students interested in Cretaceous dinoflagellate cysts. The DUXBURY (1983) database of Early Cretaceous dinoflagellate cysts is the first of a planned series ... on the type material of DUXBURY (1977) and (1980), thus completing the series on Lower Cretaceous dinoflagellate cysts. Next in the pipeline are the superb collections of Tertiary dinoflagellate ...
www.nhm.ac.uk

INA overview
... ). In addition the INA organises occasional workshops and regional meetings, e.g. workshops on Boreal Lower Cretaceous nannofossils (Zurich, 1986), Jurassic nannofossils (London, 1990), terminology (London 1992), extant coccolithophores (Crete 2003), regional ...
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FLORA OF NORTH AMERICA - Volume 1, Chapter 1
... frequent. Therefore at subtropical latitudes the east coast has a warm and rainy climate; at lower middle latitudes it has a modified continental climate with relatively cold winters and warm to ... and formed the super-continent Pangaea. In the Cretaceous, they became increasingly separate due to the expansion of new oceanic basins. In the early Cretaceous, a narrow oceanic basin formed in the ...
hua.huh.harvard.edu

Introduction to the Flowering Plants
... Flowering Plants Introduction to the Flowering Plants The flowering plants or angiosperms emerged in the Cretaceous period, some 130 million years ago. Their origin Charles Darwin described as "that abominable mystery ... major steps in land plant evolution. Click left for a handout on equivalent terms in lower and higher plants. Would you like to look at the lab for this part of ...
scitec.uwichill.edu.bb

Azolla and Anaebaena Symbiosis
... ) date back more than two billion years, fossil Azolla plants are known only from late Cretaceous deposits less than 80 million years ago. Anabaena and Nitrogen Fixation Close examination of an ... consists of a thick, greenish (or reddish) dorsal (upper) lobe and a thinner, translucent ventral (lower) lobe emersed in the water. It is the upper lobe that has an ovoid central ...
waynesword.palomar.edu

The evolution of plants: III. Permian, Triassic, Jurassic and Early Cretaceous
... and Early Cretaceous The evolution of plants A concise report of the development of the flora III. Permian - Early Cretaceous I. Silurian and Devonian II. Carboniferous and Early Permian IV. Cretaceous - present In ... quarry near Lodève in France (click photo on the right) many fossil plants from the Lower Permian have been found. Their preservation however is not as good as those from the ...
www.xs4all.nl/~steurh

The evolution of plants: IV Early Cretaceous - present
... Cretaceous - present I. Silurian and Devonian II. Carboniferous - Early Permian III. Permian - Early Cretaceous In the course of the Cretaceous a major change appeared: the flowering plants were there! In the very early Cretaceous ... the upper part of the photo to read more about this fossil and on the lower part to see an enlargment of the photo. DNA research however indicates an origin during ...
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