This is an archive of CompuServe forum messages from 1985 to 1995, as saved in transcripts by John Foust.
Search Results (31 messages)
>>As I recall, those folds are thought by some to be related to the Applachians. Do you know how they were dated? Dating has been done w/seismic data corellated to oil wells drilled in the area. The Late Permian Wolfcamp and Leonard Formations show exotic blocks of Mississippian, Pensylvanian and…
Jon, >> But do they have to be 'pre-Cretaceous'? The timing here in West Texas is late Permian (Wolcampian/Leonardian). Jim
Don, >>The difficulty seems to be that, the only available continental collision probably occurred in the late Paleozoic and there apparently isn't enough rock missing from the Applachian sedimentary sequence for the Applachians to have been in place all those years. The Ouichita/Marathon fold/thrust belt in Oklahoma and Texas is…
#Erosion in Ocean Basin
Message #172226
Hi Kamron, >>Between the land and the sediment cone there is a deep trench……Looks almost like the canyons were cut then the ocean basin shrunk away from the continents…. Its also strange that the deep trenches haven't filled with sediment.
Hi Igor, I'm not sure if it's available but try Geo-Map in Houston, Texas. They supply maps for the petroleum industry and may have something. Jim
>>Yes thats it but they continue on down some go on down to 3,000 meters like there was no water down at that level for at least a short period of time. However, if they existed prior to the opening of the Atlantic Ocean in the Mesozoic, the rivers would…
Doug, >>Some subduction in the Caribbean (creating a lot of the islands bounding it) appears to have helped let the Americas connect up; I am a little fuzzy on what goes on in that area. Everyone is fuzzy about the Carib. There are at least 5 "microplates" in the area,…
Steven, This is probably negative help, but, the USGS _Suggestions to Authors of the Reports of the United States Geological Survey_, Seventh Edition, p.55, simply says: . They are discussing the construction of columnar sections for publication by the USGS. My (very old) copy of Robert Compton's _Manual of Field…
Kamron, >>They are located mainly around the perimeters of the continents where land basins drain into shallow basins above the shelf and continue over the shelf through the sediments at the continental bases. They look like erosion canyons in the sediments. Continuations of the land erosion marks in many cases.…
Kamron, >>Even what little I remember of the Appalachians is they are tilted crust and not folded crust as expected in the old mountains. The Appalachians are fold mountains, you just need to learn to think on a larger scale. The blocks you see are just one side of the…
Joe, >>I suppose if someone were inside this "tunnel" they would not be an "up" or a "down". You would be totally confused, much like being in weightless space. I suppose you could sense "sides" but not a top or a bottom? Remember that there is still the entire mass…
Hydrogeology
Message #169943
Hi Dawn, I missed your message the first time through hope this isn't too late. Oklahoma State University in Stillwater, OK has an excellent hydrogeology program. Jim
Hi James, There is at least one discussion in progress over in the Dinosaur forum (GO:DINOFO) on human origins. You might try over there too. Jim
Hi Matt, There is a monthly magazine published by the AGI. I think they are out of Boulder, CO. It's a survey of geological and geophysical events. It is sometimes (jokingly ??) referred to as because the articles lack proper reference citations. It's a pretty good survey of current events…
All crystals have planes of weakness in their crystaline structure. These are cleavage planes. When force is applied the crystals tend to deform along the clevage planes. There is a slippage in the atomic bonds, and the crystal lattice is distorted. Jim
>>If the atomic bonds are changed how does the composition of the material stay the same or are you saying it unbonds and then rebonds back? The atomic lattice of the crystal becomes distorted. Usually by slippage between planes if that type of structure is available. It shows up in…
Mike, >> By geological dating, right? Sort of. The oil is dated by seeing how much it has aged from a presumed original composition. Crudes age in variuos ways, but usually become heavier (thicker) with age. This coupled with the idea that each source rock produces a unique product allows…
#Origin of petroleum?
Message #168125
Kamron, >>The 10,000 year old petroleum find, do you have a reference on that? Most of the information comes from proprietary data derived at the oil companies I used to work for. Try: Waples, D.W., 1980. Time and temperature in petroleum formation: application of Lopatin's method to petroleum exploration. AAPG…
#Subduction & Ocean Basin
Message #168124
Kamron, >>I agree! The pressure added caused the material to shift from solid to liquid very No shift from liquid to solid occurs. The deformation takes place at the atomic bond level. Also, this can't explain why rock can bend in tension also. Check out , Ramsey and Huber, Academic…
>>there is no evidence in our experience that solid hard brittle materials like basalt are flexibility to a tiny degree as a result of time. Sorry Kamron, but this is wrong. Any properly equipped rock mechanics lab can cut a cylinder of rock, place it in a hydraulic press, and…
Kamron, >> I really haven't given this much thought but I do believe it takes a very specific set of events to produce petroleum. All it takes is organic amterial and tiome. Heat helps speed the reaction. You can recover methane gas from garbage dumps. Given deeper burial and a…
#16077-
Uniformitarianism-valid?
Message #16121
Jon, >>Can you cite evidence for cyclothems forming today. Where? Where by processes occuring today do we see the development of coal beds or oil fields? The Gulf Coat of Louisiana, Mississippi, Alabama and northern Florida is very similar to the environment that formed the Pennsylvaniian and Mesozoic caol fields…
#16055-
Japan Quake
Message #16120
Roger, >>I would suggest – Iowa Sorry Roger, southeaster Iowa got nailed pretty hard with the New Madrid quakes in the early 1800's. How about central Saskatchewan? Your area of Texas isn't too bad either. Jim
Hi Konstantin, I remember an article several years ago that most geologic surfaces appear to be best approximated by fractal surfaces. I'm not that familiar with the math involved, but you might try looking for references on fractal geometry. Also there is a company called that advertises in most of…
>> And I don't know about the jobs database on CIS … where is that? GO:CLASSIFIEDS will get you there. Look for the E-Span jobs data base. The search capabilities were not really very good last time I was there. Jim
David, There is a jobs listing database on America Online that is searchable using the keyword "Geology". There are usually 2 or 3 jobs listed per week. There is also a database on CIS but I've never been able to figure out how to use it. Jim
New Zealand Association of Petroleum Geologists c/o Energy and Resources Division Ministry of Commerce P.O. Box 1473 Wellington, New Zealand Secretary….. Roger Gregg From the Nov '94 AAPG Bulletin Jim
What specialty area of geology does she like? Most of the schools tend to emphasize a specialty of geology (structural, hard rock, sed, strat, paleo, etc) depending on who's on the faculty. This happen even at the undergrad level. If she knows what she wants to study, pick the school…
>>As for human-produced H2S, are you saying that the level could approach 10 ppm? Yes, The situations I know about, the sensors that triggered, and the people that triggered them were in the cellar, which is a confined spave below the drilling rig, where the casin on the well comes…
John, The most common method of producing H2S is the decay of biological material. Hence the name "rotten egg gas". Your nose can detect down to 0.13 ppm. That's roughly 1/8 of 100 ppm or if you want a different comparison, about 1/6 of an inch out of 15.5 miles.…
Michael, PMFJI I've been lurking this forum for a couple of months, but this seems like a good place to say something. I work around the H2S somewhat regularly, have taught the safety course required by law for oil field workers, and just completed my annual safety certification to work…