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Approx. 90mm dia x 15mm thick Long time lurker. First time poster. Thanks for having me! Hoping for info on this specimen. I have spent about 10 hours over the last 6 months trying to positively ID and I am stumped. I found this specimen and accompanying materials after a one hour 4Lo rock crawl followed by a grueling two hour uphill hike near Horseshoe Lake, Maricopa County, Arizona. Thank goodness for traction boards or I would have been walking back to the main road! I was out for chert, chalcedony, and other fossil material when I came across this laying right on the surface. Stupidly, I should have grabbed a picture right then. In my excitement, I failed to. From the description of the surrounding area (copied below) I believe it to be some form of a Stromatolite. However, the other photos I found online don’t seem to match up very well. For one, this thing is pure black something. I cannot find an example of one this color. Also, this specimen has a “slice” that runs from approx. its center to almost its outer edge and is through the piece (visible in photo). Which makes it look much more organic in form than other Stromatolites I see. Other ones appear very “geologic” looking to me. My rockhound partners who are not deeply knowledgeable in fossils have said it reminds them of a mushroom or some type of sea anemone. That’s the type of organic matter form that it resembles anyway. As a long time hound myself, I am struggling to determine the composition. It’s not like coal and doesn’t resemble any material I have previously seen or collected. It’s really best described as “graphite like”. The smaller pieces pictured have also given me few clues. They leave a brownish black streak on white paper. I cracked a small piece of the end of one and in the sun the material really sparkles like glitter and is a bit sandpaper-ish. On the outer surface the material is smooth feeling otherwise. Other guesses are some type of larger Tufa or a Coprolite of some sort (but what sort). I am definitely all ears and thank you in advance for taking your time to look. Info on the surrounding areas and why I believe it may be some type of Stromatolite: "That's not snow! This is Chalk Mountain adjacent to the Horseshoe Reservoir on the Verde River. According to Wrucke and Conway (1987, USGS OFR- ), Chalk Mountain consists of white to light-gray, finely laminated limestone. Chert also occurs but is minor. Small centimeter-scale stromatolite-like mounds suggest an origin as algal mats growing on a paleo-lake bed. The authors suggest the deposit may be correlative with the Plio-Miocene Verde Formation." For the report and map: LINK
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From the album: Fossil Collection: DC Area and Beyond
Petrified Wood Unknown location, AZ Unknown Late Triassic-
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From the album: Fossil Collection: DC Area and Beyond
Brachiopoda Payson, AZ Naco Formation Carboniferous-
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From the album: Fossil Collection: DC Area and Beyond
Brachiopoda Payson, AZ Naco Formation Carboniferous-
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From the album: Fossil Collection: DC Area and Beyond
Bryozoa Payson, AZ Naco Formation Carboniferous -
From the album: Fossil Collection: DC Area and Beyond
Petrified Wood Unknown location, AZ Unknown Late Triassic-
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Wanted to showcase a small collection amassed over the past 3 years travelling around the eastern US Pictured: Carboniferous & Devonian from PA, Cretaceous from NJ/DE, Miocene from MD/FL, Triassic from AZ & Pleistocene from NJ/MD/FL Some of my favorite pieces 1 - Trigonocarpus sp seed from St. Clair, PA. Excellent preservation in 3 dimensions 2 - Muskrat skull from Calvert County, MD 3 - Lobster (Hoploparia sp) from Ramanessin Brook, NJ. Poorly preserved but rare to find intact 4 - Pleisosaur tooth from Ramanessin Brook, NJ
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From the album: Fossil Finds
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I've been trying for a few years to find out what this is. Found it in Flagstaff AZ. It's feels heavy like a rock, has a core that looks like bone marrow. Outside is fuzzy, bumpy looking/feeling but like rock & one outside corner looks burnt. Thanks!
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Hey fossil people... more specifically hey Arizona fossil people. I'm wondering if any of you have run across fossilized horn coral in this state? If you have, tell me about it. I'd love to see examples of what you've found. I"ve found lots of brachiopods and other marine life in Arizona but this is the first time I've found horn coral. The idea that Arizona used to be underwater is fascinating to me. Theyre not the prettiest specimens... but i found them and they're mine! Lol. For those wondering, I found these near Payson Arizona. Same place I've found byrozoans, brachiopods, and crinoids.
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hello everyone, I'm a newbie here and with fossils and hoping y'all's experience can help me out...I live in Globe, Az and I find some awesome rocks and minerals...however I know nothing about fossils...I found this HUGE rock last year and everyone that see's thinks it might be fossils? I do know the area was underwater "back in the day"...so we have lots of limestone conglomerates that formed. The first picture is of a oval shape something that might be a fossil... it's roughly 4" by 2" width. It has lots of texture to it. The parts I'm asking about that might be bone fossils is at it's tallest is 1 1/2 foot tall and roughly 4-5" wide at the top. There are two of the "bones" one in from of the other and they are the same shape and size. The rock itself is roughly 1 1/2 by 1 1/2 feet tall/wide Weighs roughly 150 pounds. Thank you in advance for help! Sheena Globe, Az.
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