I need to do a report about cobras in the paleozoic or mesozoic eras. Can you help?
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The Elapids (the group of venomous snakes to which the cobras belong) only evolved about 15 million years ago.\n\nThe only snakes around in the Mesozoic would have been similar to the pythons and boas of today.\n\nThe largest group of living snakes, the Colubroids (which include the Elapids, vipers, sea snakes, garter snakes, king snakes, and most other groups of living snake) only evolved about 20 million years ago, making the late Cenozoic the era of highest adaptive radiation among the snakes.
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http://www.atlas.keystone.edu/research/geology/03HistoricalGeology.htm\n\nThere's a start, just search for the word pennsylvania on the site.\n\nHere's some on the cambrian:\nhttp://www.paleoportal.org/time_space/state.php?state_id=9&period_id=16
951088
just go in ask.com on type in fossils
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Too long to list:\nhttp://seis.natsci.csulb.edu/bperry/ROCKS.htm\ngood site
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The lower Ordovician, about 490 million years ago. This link you have to scroll down quite a bit.
260246
if you are looking something about tectonic... you will find interesting these sites:\nhttp://pubs.usgs.gov/gip/dynamic/dynamic.html\n\nbut if you want to read about evolutio on Earth... this link is really good:\nhttp://evolution.berkeley.edu/
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543 million  years ago (Evolutionary Analysis 2nd Ed, by Freeman & Herron).\n\n544 million years ago\nhttp://geology.er.usgs.gov/paleo/glossary.shtml#p\n\n570 million years ago\nhttp://www.palaeos.com/Geochronology/gcglossary.html\n\n600 million years ago\nhttp://www.scienceclarified.com/Ga-He/Geologic-Time.html\n\n(Absolute dating is not exact. See the last link)
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maybe this can help\n\nhttp://en.wikipedia.org/wiki/Fossils
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You are looking for the Cnidaria corals I believe. In the early Paleozoic (cambrian to silurian) they diversified into tabulate corals, rugose corals, and heliolitid corals. All these forms were wiped out at the end of the Permian Period, in a mass extinction event that claimed something like 95% of all marine invertebrate species.\n\nDescriptions of these types of corals are linked in this page:\nhttp://www.ucmp.berkeley.edu/cnidaria/cnidariafr.html\n\n\nTHis page may also be a big help to you:\nhttp://www.paleoportal.org/fossil_gallery/taxon.php?taxon_id=55
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Have you seen this site:\n\nhttp://www.palaeos.com/Paleozoic/Carboniferous/Pennsylvanian.htm
265420
Here, try this:\n\nhttp://www.rocks-and-minerals.com/\n\nCheers.
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http://en.wikipedia.org/wiki/Ice_age\nhttp://en.wikipedia.org/wiki/Timeline_of_glaciation
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The following link has info about habitat, size, pics, etc.\n\nhttp://www.discoverlife.org/nh/tx/Vertebrata/Mammalia/Dipodidae/Zapus/hudsonius/
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Try the ntional geoligical survey. Its a web site
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carnivore-cougar, weathering-whirlwinds, ecosystem-environment, erosion-earthquake (not very near) ?
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I cant tell you its value, but go to a geological estimator and ask to have a carbon test done for an estimated date of formation. With that date, an accurate value will be easier to ascertain with the services of an experienced fossil valuator.
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www.geology.com\n\nSeriously...\nGo there.