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Showing results for tags 'stratigraphy'.
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I've been curious about 'core samples' obtained from wells and geologic exploration. Is there anywhere online that one can look at examples of bedrock cores. For example, I'd love to see what a cambrian core looks like from deep in the Illinois bedrock and how deep the sample was located. I know mostly they are looking at microfossils to determine the age, but I've seen a few times where more easily identifiable fossils are found in the cores. Anyone have examples or know where some are found. And with any examples, it would be of interest to know how many feet deep the core comes from.
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- core sample
- geology
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My folks have a nice lake behind their house. It is relaxing to spend a warm evening watching a heron spear fish or geese fight each other. Or watch silt slowly fill the lake bed. Across the street, a housing developer stripped off a bunch of soil down to the bedrock, but ran out of money before building on the land. This has resulted in some significant erosion and sedimentation in the lake, but this cloud does have a silver lining. I soon noticed a thick bed of shale exposed on the hill. So it was only a matter of time until I make the short trip to the top. The hill, with exposed shale, can be seen on the right. No, I did not hunt that day. A few weeks ago, I drove up there and poked around the Pennsylvanian strata. The Island Creek Shale is the first bed encountered: There are thin beds of calcareous sandstone within. Oh look, ripple marks: And trace fossils: I've found fusulinids and brachiopods where the shale thins several miles to the south.
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What do the strata at your collecting sites, or in the vicinity, look like? What type of fossils do you find in them? What other interesting geologic features are present? I will post some images as soon as I can get to them....
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Finally ... a discussion of fossil sharks from Morocco and transitional teeth.
Northern Sharks posted a topic in Member Collections
Santa came early here in the north country. I've been after one of these for a while and I finally got one in the mail today. It's an early, transitional form, Palaeocarcharodon orientalis. Very coarse serrations near the root fading to almost smooth at the tip. One root tip was glued back on as these teeth are very prone to damage, but I can ignore that because it's almost 2 inches long, and they don't get much bigger than that.- 156 replies
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- cenozoic shark teeth
- cretaceous shark teeth
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- cenozoic shark teeth
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- cretalamna
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- mega tooth shark lineage
- palaeocarcharodon
- paleocarcharodon
- paleocene shark teeth
- paleogene shark teeth
- parotodus
- sharks
- stratigraphy
- thanetian shark teeth
- transitional teeth
- ypresian shark teeth