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Showing results for tags 'igneous'.
Found 8 results
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Before I get stoned to death for posting this here (lame pun intended)…let me just say that I honestly have no clue what I’m looking at here but I am not suggesting, nor am I of the mind—that it’s a fossil, but it was just so strange lookin’ that I couldn’t help my curiosity, so here I am asking for opinions on what caused this to form and what it’s composed of most likely (if anything other than limestone, that is…. (-__-). location- far nw San Antonio, tx , just outside the foothills of the hillcountry (helotes, tx) Again, I do want to apologize if this belongs in a strictly geological forum somewhere, I’d have probably posted it there instead, had I been aware of one existing which was similar to this platform but exclusively for weird ugly rock identification help (lol). Thanks in advance.
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This is my current labelled collection. I have other stuff that I found on a fossil hunting holiday in the South West of England, but I’m very amateur so I don’t actually know the scientific names for a lot of them. Everything on this shelf was found except the teeth on the left and right, which were bought on the Isle of Wight. Essentially everything on this shelf was ID’d by members of this forum, except the pyrite and favositid, which were ID’d by friends, and the igneous rock and ammonites, which I didn’t feel i needed to have ID’d. The ammonites are my pride and joy, very detailed.
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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
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I live in southern Michigan in the Oakland County area. There are a lot of gravel pits in the area that are full of fossils from up north and the Canadian Shield that were brought over by the glaciers in previous times. Most of my fossil collection from the area consists of red limestone rocks with corals, pieces of crinoids, and brachiopods. This rock, however, is different. A few years ago I found a neat rock in my backyard. Took a few more pictures of the matrix itself, but there's a limit to the number of pictures I can post at once. I'm not an expert in geology, so I'm not sure what kind of rock this is exactly, but it's certainly not limestone or some sedimentary shale. The rock is quite hard, difficult to chip with a hammer, and appears to have many silicate inclusions. If I didn't know any better, I'd say it's granite. On the edge of the rock there is an interesting black protrusion of material that looks decidedly different from the rest of the stone. Since the rock looks like an igneous rock, I don't think the black mark could be a fossil, but at the same time, maybe the rock once was a sedimentary stone that metamorphosed into what I'm looking at.... Like I said, I know nothing about rocks, so I'm just guessing. Is it possible this is a fossil? Good Hunting, Brian
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Hello again, I found this rock 20+ years ago in Sept-Iles, QC, Canada on a business trip. I thought is was very cool but it has been sitting in a box until now. I read Sept-Iles is located in the Canadian Shield, a large area of exposed Precambrian igneous and high-grade metamorphic rocks (geological shield) that forms the ancient geological core of the North American continent. It is black and looks like it has been cut and polished and has striations. The polished face measures about 3 x 1/34 inches. What kind of rock is it? What made the striations, a glacier? All help is appreciated.
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Found this on the coast in Spiddal Ireland. Not sure is a piece of igneous rovk or something else.
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Hey hi Y'all, In a recent thread there was some discussion as to whether an ash fall from a volcanic eruption produced a volcanic or sedimentary rock. Also a lahar (volcanic mudflow) was referred to as being a sedimentary event. I would like to get the opinions of the members here on TFF. Does a volcanic eruption produce sedimentary rock?
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I know nothing of the real provenance of this specimen. It was found near a house here in western Missouri where everything is either Pennsylvanian or Quarternary--there is no igneous rock in the area. I have three questions about it. First, is it a fossil or is it modern? Second, is the rock on which the specimen rests igneous? Third, is it a forgery—something made for a novelty shop? Any answers or comments you can give will be appreciated. Russ
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