MPH Posted May 5, 2014 Share Posted May 5, 2014 I am intrigued by the near perfect circular shape of this rock. Found in Mississippian river rock. Link to comment Share on other sites More sharing options...
Auspex Posted May 5, 2014 Share Posted May 5, 2014 I wonder if it's from a core? What does the reverse look like? "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
Kman100 Posted May 5, 2014 Share Posted May 5, 2014 The bryzoan is a Fenestella, I beleive. -kevin Link to comment Share on other sites More sharing options...
painshill Posted May 5, 2014 Share Posted May 5, 2014 Interesting. I wonder if someone was trying to make a pendant (Native American?) That looks like an attempt to make a suspension hole at 6 o'clock. Maybe it was too hard to get through, or the drilling hit a hard inclusion/fossil. Roger I keep six honest serving-men (they taught me all I knew);Their names are What and Why and When and How and Where and Who [Rudyard Kipling] Link to comment Share on other sites More sharing options...
MPH Posted May 5, 2014 Author Share Posted May 5, 2014 Here is reverse. Link to comment Share on other sites More sharing options...
Auspex Posted May 5, 2014 Share Posted May 5, 2014 Yup, I think this is a piece of a drill core. "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
piranha Posted May 5, 2014 Share Posted May 5, 2014 Yup, I think this is a piece of a drill core. A left-behind bit from a geo survey? Congrats on finding it! Link to comment Share on other sites More sharing options...
Pumpkinhead Posted May 6, 2014 Share Posted May 6, 2014 Yep that's a fenestella Link to comment Share on other sites More sharing options...
Herb Posted May 6, 2014 Share Posted May 6, 2014 looks like a core sample to me also, with fenestrate bryozoan. I once broke a core sample (Ord) and found a nearly complete prone Flexicalymene trilobite. Alas, It vanished while I was away in the Navy. "Absence of evidence is not evidence of absence"_ Carl Sagen No trees were killed in this posting......however, many innocent electrons were diverted from where they originally intended to go. " I think, therefore I collect fossils." _ Me "When you have eliminated the impossible, whatever remains, however improbable, must be the truth."__S. Holmes "can't we all just get along?" Jack Nicholson from Mars Attacks Link to comment Share on other sites More sharing options...
MPH Posted May 6, 2014 Author Share Posted May 6, 2014 Being a newb without much background in geology or paleontology, can you guys give me a little more info on what a core sample is and how it likely came to be? Thanks!! Link to comment Share on other sites More sharing options...
Magicman Posted May 6, 2014 Share Posted May 6, 2014 Core sample is a mining term. They use a large machine that drills straight down into the earth. The drill has a hollow core. When extracted, you get depending on the size of the drill bit, generally a one to three foot sampling of the layers of rock and mineral at the depth that they have reached. In most cases, the miners are looking for minerals (Ruby, Emerald, etc.) or most likely - metals (like gold, copper, nickel, etc). Core samples that have no indication of minerals or metals are usually discarded at the site. Those with evidence of minerals or metals are sent to a lab for analysis. Bob Link to comment Share on other sites More sharing options...
MPH Posted May 6, 2014 Author Share Posted May 6, 2014 Thanks Bob! And thanks to everyone for help in the ID! Link to comment Share on other sites More sharing options...
MPH Posted May 6, 2014 Author Share Posted May 6, 2014 (edited) One other question about this specimen....painshill had mentioned the possibility of an attempted suspension hole at 6'oclock. I see these little, incomplete holes from time to time on various rocks. Is there a natural explanation for this finding? Edited May 6, 2014 by MPH Link to comment Share on other sites More sharing options...
prem Posted May 6, 2014 Share Posted May 6, 2014 It's also possible from a bore hole used to insert explosives when blasting out a roadcut. For very hard rock, these semicircular impressions persist for many years. Link to comment Share on other sites More sharing options...
squali Posted May 6, 2014 Share Posted May 6, 2014 Soil/rock coring is used in several disciplines for different purposes. Civil engineers and Geotechies analyze the strength and porosity of the subsurface to design suitable foundations for everything from dams and bridges to buildings and highways. Geologists study formation sequences and the associated fossil fauna (think natural gas exploration). And as Magicman said the technique can be used for mineral exploration. All of the blasting I've seen has been with drill holes but I guess if you need more bang the blast holes could be cored, though it would be rather expensive. It's hard to remember why you drained the swamp when your surrounded by alligators. Link to comment Share on other sites More sharing options...
Auspex Posted May 6, 2014 Share Posted May 6, 2014 The field drilling method of paleomagnetic sampling also uses coring: LINK I first learned of this in Peter Wards great book Gorgon. 1 "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
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