What was the Geology of Philadelphia, PA during the Precambrian Era?
598314
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
247235
Philadelphia, for 10 years before 1800, and New York for a few months before that.   Washington became the capital in 1800.
522703
I take it that you do not mean the Philadelphia Experiment. The Philadelphia Incident is said to have occured on September 2, 1944; it was a nuclear accident and part of the Manhattan Project. It happened at the Naval Yard in South Philadelphia. The story is that three researchers went to fix a clog in the instruments that they were using to attempt to build a nuclear weapon. An unexpected pipe burst caused them to be showered with uranium hexaflouride which converted to hyrdoflouric acid burning two of the men to death instantly. Because of the super-secret nature of the Manhattan project their deaths had to be covered up for a long time. All of this information comes from the website listed below. It should be noted that it is the only website that claims these events occured in Philadelphia, most other websites say that the incident occured at the Oak Ridge National Laboratory in Tennessee. I have no idea which version is true.
193598
well, there is the theory of plate tectonics which tells us that the earth's crust is comprised of plates that converge, spread, subduct,  and slide with one another.  This is the main culprit of orogeny, which is mountain building.  Then you have to consider weathering which is performed mainly by wind and water, ie..rivers, lakes, streams, ocean currents and tides.  Once that has taken place erosion takes effect and carries the weathered material away and deposits it somewhere else.
610850
I'm from Philadelphia  , \n Where are You from ?
893082
You can type in geomorphology and use the various terms in a search engine.\nYou could read your Geology 101 text book.
835370
During the Permian period, changes in the earth's surface that had begun in the preceding Carboniferous period reached a climax. At the close of the Carboniferous, large areas of E North America were dry land. In the Lower Permian, sandy shales, sandstones, and thin limestones of the Dunkard formation (formerly called the Upper Barren measures) were deposited in the remaining submerged areas of West Virginia, Pennsylvania, and Ohio, but the continued rising of the land soon put an end to deposition. The Dunkard is the last Paleozoic formation of the E United States. More extensive deposits were formed in the West. Parts of Texas, Oklahoma, Kansas, and Nebraska were covered by an arm of the sea or possibly by one or more salt lakes or lagoons, now represented by masses of salt or gypsum in layers separated and overlaid by red beds. There are important Permian salt mines at Hutchinson and Lyons in Kansas and gypsum mines in Oklahoma, Texas, and Kansas. The longest marine submergence of the Lower Permian in North America was in W Texas and SE New Mexico, where there is a system of marine limestones and sandstones 4,000 to 6,000 ft (1,200-1,800 m) thick. The Cordilleran region was also submerged; here marine beds are more common toward the west, and land sediments, especially red beds, toward the east. The red beds are generally considered to be indicative of increasingly arid conditions in Permian times. \n\nIn Europe, the Lower Permian, or Rotliegendes [red layers], was marked principally by erosion from the Paleozoic Alps of the Carboniferous into the low-lying land to the north; the formations are chiefly shale and sandstone, with some conglomerate and breccia. Red is a prominent color for the beds. The Pangaea supercontinent formed from an aggregation of all continents at this time. \n\nThe Permian and late Carboniferous of the Southern Hemisphere were radically different from those of the Northern Hemisphere. Australia, S Africa, and South America experienced a series of glacial periods, as is shown by the presence of tillite and of conspicuous striations of the underlying rock formations. This condition prevailed also in India. Paleozoic glaciation in North America is suggested by the Squantum tillite near Boston, Mass. This glaciation and the aridity of which the red beds seem to be the result are the two most strongly marked characteristics of the Permian period. \n\nThe Upper Permian \n\nIn the Upper Permian practically all of North America was above sea level, and the continent was larger than at present. Toward the close of the Upper Permian the greatest earth disturbance of the Paleozoic era thrust up the Appalachian Mts. In Europe, the Upper Permian was a period of more extensive marine invasion; the Zechstein formation is predominantly limestone, though it includes rich deposits of copper, salt, gypsum, and potash. The Upper Permian beds of Germany were long the chief source of the world's potash. \n\nEvolution of Plant and Animal Life \n\nMany marine animals became extinct during the Permian, but there was at the same time an evolution to more modern types, a marked change in the insects, and a notable increase in numbers and varieties of reptiles mainly because of the continental changes. Among plants, Lepidodendron and Sigillaria became rare, but ferns and conifers persisted. The widely distributed "seed fern," Glossopteris, which was apparently successful in resisting glacial conditions, was the most conspicuous development in the Permian flora. The presence of Glossopteris in South America, Antarctica, Australia, and S Africa is a strong argument favoring the interconnection of these land masses in a large supercontinent during Permian time. The end of the Permian is marked in the fossil record by a mass extinction . \n\nGo to this website to find the Upper level of the Geological Time Scale: http://www.encyclopedia.com/doc/1E1-geotimeTABLE.html\n\n\n\nGlad to Help!
716822
need to have background on the following:\n\n-geology\n-geography\n-metallurgical\n-mining
361975
Massachusetts and Pennsylvania
479973
There are some famous places where Precambrian rock is exposed such as the Canadian Shield. It spans across Canada & parts of Greenland.\n\nThe basement rock in the Grand Canyon (rock on the bottom) is also visible.\n\nMost Precambrian rock is covered w/ sediment & or sedimentary rock where lowlying areas of it exist.\n\nAnywhere where Precambrian rock has been uplifted is a good place to look. Like the Teton Mtn. Range in Wyoming. That would be your best bet. At the feet of fault block mtn. ranges.
532046
woohoo geology... lets see if I remember anything...\n\nOkay here is a basic thing, the composition of rocks, especially it's silicate level, can tell us much about the molten/semimolten layers of Earth.... Okay I was enver very good in this subject, so look here...\nhttp://en.wikipedia.org/wiki/Geology
75633
pennsylvania has a city named Old Forge...supposedly the pizza capital...and may i just add a very pregnant Yumm!!
420663
In Engilish it's actually Pre-Columbian (not Columbia)\n\nIt's refering to something that happened before the first europeans came to the America's. For example, the Mayan and Aztec histories are pre-columbian.
780259
http://vulcan.wr.usgs.gov/LivingWith/VolcanicPast/Places/volcanic_past_oregon.html\nSea Lion Caves are reputed to be the largest sea-cave in North America, and is an outstanding example of erosion by waves in basalt. \nBasalt: \nBasalt is a hard, gray to black extrusive volcanic rock, mafic (rich in iron and magnesium), fine-grained, sometimes displays frozen gas bubbles (vesicular texture), and sometimes contains phenocrysts of feldspar (Ca-rich varieties), hornblende, pyroxene, biotite mica, sometimes quartz or olivine. \n\nhttp://www.oregon.com/attractions/sealioncave.cfm\n"History: The cave was discovered in 1880 by Oregon ship captain William Cox. … Officials at the caves estimate the cave began formation about 25 million years ago and now is the height of a 12-story building. … The elevator was added in 1961 to give people access to the basalt rock cave"
56877
Try the ntional geoligical survey. Its a web site
362501
PHILADELPHIA PHILLIES
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I lived in both. I enjoyed both. Do you want to be closer to NYC or Philly for down-time? They are good places to live if you want access to Urban benefits. NJ is slightly more expensive in almost everything than PA, but that's because it's closer to Manhattan and the shoreline. If you work in Philly, would you consider living in Philly?