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Showing results for tags 'metamorphic'.
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I have been going through a collection of petrified wood from near Hampton Butte in central Oregon. The petrified wood in this area is often a green or red Jasper type stone. Many pieces show bark texture or even growth rings. I found one intriguing chunk of green Jasper that has various bits of leaf imprints on one side. It’s only about 4 inches in size. I’m not sure if my photos show the smaller subtle leaf pattern that I believe I see (in addition to the more prominent deeper lines running all the way across). I was under the impression that a leaf imprint should be in sedimentary material. This green Jasper type rock is obviously a product of intense natural forces so I am curious how something as fragile as a leaf could have its shape preserved? I hope my photos and questions make sense. Thank you for reading and any ideas!
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I'm working with Dr David Campbell on possible fossils found associated with the Murphy Marble Fm in Western North Carolina. In 1973. Don Hathaway was logging cores at the Nantahala Limestone Quarry when he found what looked to be organic remains in a couple of cores cut into the Murphy Marble Fm. The age of the Murphy Marble is enigmatic, because of the lack of fossils in it, and it doesn't have the minerals that could be used to determine radiometric ages. The metamorphic grade of the marble and associated formations are garnet to staurolite grade. It's believed that these units were metamorposed during the middle or late Paleozoic. Unfortunately we couldn't handle the cores, and we were only allowed to photograph them. Since neither of us hasn't done research on brachipods before we are looking for opinions on the of these apparent organic remains. I almost forgot to mention that these fossils were apparently in an unit above the Murphy Marble Fm in the base of the overlying Mineral Bluff Group. I didn't take the photos so I don't have a scale for them. I finally did dig up a old picture from a talk given back in 2019 at a NCFC meeting in Raleigh and got a screenshot of part of the article to give you an idea of the scale on these pics.
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- murphy marble
- metamorphic
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PA fossil rock ID, very heavy, found near Devonian fossils
LindsayWilson posted a topic in Fossil ID
I found this in our backyard in a rock pile. I find many Devonian fossils in the shale lined creeks around Erie, PA. This rock appears to be similar but is extremely heavy and different colored. I can make out fossils but don’t recognize some of the imprints abs it appears folded and is SUPER heavy. For comparison, the rock I found with it, also pictured here is about 3-4x the size but the smaller one weighs 3x as much. No magnetism, but has a burnt spot. Was it perhaps originally a large piece of the lighter fossil plate that someone burned (possibly in a fire pit?) and that is how it appears metamorphic and significantly heavier or more dense? does not look like a meteor...no shiny smooth surface, etc.... any ideas?- 2 replies
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- pennsylvania
- devonian
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Found this formation on the bank of the Dnieper River, Ukraine, Kherson region. Sizes: 73mm length and 32mm width. Composition: the surface layer consists of steatite; the next layer is similar in color to the bone, has many small (less sand) and a little medium-sized pores, a hardness of about 4,5-5, actively foams under the action of hydrochloric acid; the inner layer of blue material has a dense structure similar to flint or chalcedony with impurities, chalcedony does not scratch. Can it be hidrotermal metamorphic fossil, or simply geology formation?
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My metamorphic/igneous trip to Socorro, New Mexico.
Innocentx posted a topic in Fossil Hunting Trips
All the beauty you see against the blue sky is a story of time from the book of rocks, uplifting, cleaving, and eroding in wonderful ways. I searched and got this Socorro County geologic map. A rather immense amount of study involved in this document. Best at 175% zoom. If I lived there all the time I might come to understand it. https://geoinfo.nmt.edu/publications/openfile/downloads/200-299/238/ofr_238.pdf- 39 replies
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- metamorphic
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