fossil occurrence

Listing 1 - 10 from 22 for fossil occurrence

pollen grain morphology juniper
... visible in fresh pollen. Sculpturing gemmate and the gemmae (spherical elements) deciduous. Fossil pollen ordinarily split, forming the characteristic "pac man" shape. Pollen scanning electron ... with that of the "Taxodiaceae" (papillate grains) and Taxaceae -- the "TCT" pollen type. Fossil Occurrence: Plant fossils (leaves, cones) are known from the early Mesozoic onward. References: Erdtman ...
www.geo.arizona.edu

pollen grain morphology ephedra
... lower Grand Canyon. Preservation: Good preservation. Fossil Occurrence: Ephedra is an member of the ancient gymnosperm Class Gentophyta, whose foliage is present in the fossil record from the Triassic onward, associated ... Links Geocities site with lots of plant photos Intro. Gymnosperms by Beth Budny Eocene Fossil Lake, MT Univ. Alberta Bot. 511 Notes Sahara Ephedra % Dupont Leroy KEY TO POLYPLICATE ...
www.geo.arizona.edu More from this site

Cycas maconochiei
... area west of Darwin, and a very large disjunct occurrence south of the Daly River and towards the coast. Three geographically separated occurrence are recognised as subspecies. Key to the subspecies. 1 ... on old beach sands. Known only from around Fossil Head. Conservation status: not considered to be at risk. Although not reserved, the remote occurrence of this subspecies would buffer it from any ...
plantnet.rbgsyd.nsw.gov.au

MyToL: Customizing the Tree of Life
... and select 'Hide glossary entries'. If you want to look up words independent of their occurrence on a ToL page, you can also go to the ToL Glossary page, which provides ... browse a version of the ToL that emphasizes information about certain subject areas, e.g., fossil evidence, biogeographical evidence, osteological data, secondary metabolites, etc. Allow visitors to browse a version of ...
tolweb.org

Azolla and Anaebaena Symbiosis
... cling to the female megaspores, thus facilitating fertilization. According to some references, the universal occurrence of Anabaena azollae inside the leaves of Azolla suggests that reproduction of this ... Although filamentous cyanobacteria (with cells resembling heterocysts) date back more than two billion years, fossil Azolla plants are known only from late Cretaceous deposits less than 80 million ...
waynesword.palomar.edu

Continental Drift & Plant Distribution
... scales bear large, bright red seeds which sink in water. Cycads date back in the fossil record to a time when dinosaurs roamed the land and when the earth's continents ... exist during the time frame of Pangea. Several theories have been proposed to explain the occurrence of two remarkably similar species of copal-bearing trees of the genus Hymenaea on the ...
waynesword.palomar.edu More from this site

Ferns UW Aberystwyth Botanic Gardens
... Marattiaceae family from tropical and subtropical humid forests, mostly in the Western Pacific area. The fossil record of the Marattiaceae extends back to the Carboniferous (345 to 280 Mya). In the ... male (micro-) and female (mega-) spores. Fossil megaspores of the Salvinia type in the Upper Cretaceous (100 to 65 Mya) represent the first known occurrence of the genus. Back to Botany Gardens ...
www.aber.ac.uk

THAISZIA - JOURNAL OF BOTANY
... known well today. Here we present you detailed information on the hometown of the "Living Fossil" with it's various resources of geography, weather, forests, vegetation, species, Metasequoia native trees as ... were carried out for common yew (Taxus baccata L.) from one point of its natural occurrence (State Nature Reserve Plavno, Slovak Ore Mts., samples marked as PL) and two urban habitats ...
www.bz.upjs.sk

Climate during the Carboniferous Period
... Coal deposits play an important role in this record. Coal is mostly carbon accumulations from fossil plant material deposited in swamps so devoid of oxygen that bacteria and other critters ... landmass distribution, when they exist concurrently, appear as a sort of common denominator for the occurrence of very long-term simultaneous declines in both global temperature and atmospheric carbon dioxide ( ...
www.clearlight.com

Maryland Geological Survey: Miocene Fossil Teeth (Sharks)
... examples known having been obtained from Charles County, and forming part of the Thomas Collection. Occurrence.— Calvert formation. Charles County near the Patuxent river. Collection.— Philadelphia Academy of Natural Sciences. updated ... pages were prepared by R. D. Conkwright) | Return to previous page | Go to the Miocene Fossil Teeth Home Page | Next Page |
www.mgs.md.gov

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