What did the surface look like in the Devonian time period?
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http://www.scotese.com/newpage3.htm
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It has been about 4.5 billion years since the planet formed.  The surface of Venus is much younger, only dating back to about 500 million years or so.  We think that volcanic activity on Venus can lead to radicle resurfacing events that litterally cover the entire planet with a fresh layer of rock.
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I like this site for looking at where the continents were at different times as the forces of plate tectonics (continental drift) occured.\nhttp://www.scotese.com/earth.htm\n\n50MYA: http://www.scotese.com/newpage9.htm\n150MYA: http://www.scotese.com/late1.htm\n\nThey even project into the 250MY into the future:\nhttp://www.scotese.com/future2.htm\n\nThey also animate the movement of the plates:\nhttp://www.scotese.com/newpage13.htm
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Applications of the concept that the present is the key to the past in the earth's history:\n1. volcanology: Today, volcanic rocks are generated at active volcanic centers--from the cooling of lava. We assume that when we map out similar rocks in older strata that they also formed at volcanic centers--even if there is no active volcanism in the area today. \n2. paleontology and paleoenvironment: We know that certain plants and animals live in the ocean and certain organisms live on land.  If we find fossils of marine organisms(like oysters, corals, ammonoids, shark teeth) in sedimentary rocks on high mountains, we interpret that the strata were originally deposited on the sea bottom that has since been uplifted.\n3. paleoenvironment: we know that modern desert areas covered by dunes have certain characteristics--that the dunes have certain types of crossbeds, the sand is well-sorted and well-rounded, for example. If we observe similar characteristics in sandstone beds of the Colorado Plateau, for example, that is considered evidence for an arid desert environment in the past.\n4. Modern plate boundaries are associated with major fault systems, certain rocks types, etc. In  the Sierra Nevada, geologists have mapped out ancient fault boundaries that put marine sedimentary rocks against dissimilar volcanic arc-related rocks. The patterns they have mapped out are considered evidence that the plate boundary of North America was once a convergent margin located farther east than it is today.
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the type of surface\nthe surface area
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ice age.\nThey are huge ice cubes left over from the Ice Age.  Mostly in the Northern areas, such as Alaska, they carve out beautiful Fjords, and are a wonder to see.
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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
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anywhere that was undetwater for a significant time in geologic history
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i think its clear, with a tint of pink.  and its a rock, so it cant change all of a sudden, it needs millions of years of heat and pressure.
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"The oldest indications for the existence of real land plants have been found in cores from boreholes in Oman. They contained fours of mutually connected spores (tetrads) enveloped by remains of the spore sac in which they had been formed. Research on the spore walls point to a relationship with the liverworts. The fossils have been found in the Middle Ordovician and are about 475 million years old."\n\nSee the link below for 2 pages of info on the development of this.
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It was once thought that land on earth is stationary and that the continents had always been their current shape, even though they may have been covered by more water.\n\nMore recently however, it has been discovered that the continents were actually all one mass of land and at one point separated, floating apart on sheets of plate tectonics.  \n\nProof came quickly.  It is now easy to see the east coast of South America fitting into west Africa for instance.  Bones of related land-dwelling creatures were also found on the coastlines of the two distant continents.
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you mean the triassic period? just use google image search for the pictures..there should be at least 10 pages of images show up on the search result :]
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I think you are asking about the evidence of sandy deposits on Titan. They suggest from the evidence there are what look to be sand bar like objects on Titan leading to the next conclusion there was once a form of liquid on the surface.
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Torbay, despite being a built up area, has some spectacular Coast Path scenery and geology. Here the rocks were literally turned upside down by earth movements during a mountain building phase 280-300 million years ago. Large scale folding and faulting of the rocks can be seen around Thatcher Rock and Hopes Nose. At Meadfoot strange fossils in the limestone tell us about tropical reefs of the Devonian period. Around Goodrington, younger rocks that formed as the mountains were eroded in a hot arid environment, contain boulders and pebbles from the older limestones and shales. These red beds form the headlands at Livermead and Roundham Head. At Thatcher Point, just along from Hope's Nose, you can clearly see the hundreds of layers of limestone which were formed over millions of years - try the sites below.
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Here is one of the most detailed ones available on the internet from the Geological Society of America:\nhttp://www.geosociety.org/science/timescale/timescl.pdf\n\nUSGS has some interesting versions that are put in scale relative to time, so they show dramatically how much longer previous Eons were in comparison to recent Eras:\nhttp://geology.wr.usgs.gov/docs/parks/gtime/gtime2.html\n\nHere is the UC Berkeley Geological Time Machine:\nhttp://www.ucmp.berkeley.edu/help/timeform.html\n\nFinally, if you want to see the coolest images of paleogeography on the net check out Dr Blakey's website at Northern Arizona University:\nhttp://jan.ucc.nau.edu/~rcb7/nam.html\nor at:\nhttp://jan.ucc.nau.edu/~rcb7/
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http://www.psigate.ac.uk/newsite/earth_timeline.html\nhttp://www.sdnhm.org/fieldguide/fossils/timeline.html\nhttp://www.talkorigins.org/origins/geo_timeline.html\nhttp://en.wikipedia.org/wiki/Geologic_timescale\n\nI hope these help.
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Lower Devonian Oriskany Sandstone\nUpper Devonian Shale's\nCoal Bed Methane