• Corinne posted a new activity comment 2 months ago

    2 months ago
    2 months ago

    use macrostrat.org and click geologic map. Search the nearest city to where you got these, then see if you can find the actual spot. You can also use the rock’d app on site if there is service.

  • Corinne posted a new activity comment 2 months, 2 weeks ago

    2 months, 2 weeks ago
    2 months, 2 weeks ago

    you can absolutely put an age in them. go to macrostrat.org and choose geologic map. Search up the town and play around. It’ll do a pretty good job of getting you the right data, you’ll just have to check the deposition environments to make sure the match what you find. These fossils are gorgeous

  • Corinne posted a new activity comment 2 months, 3 weeks ago

    2 months, 3 weeks ago
    2 months, 3 weeks ago

    I think you are right that it’s a piece of jaw. @mason-hintermeister can you help on this?

  • Corinne posted a new activity comment 3 months ago

    3 months ago
    3 months ago

    Click on your post, there’s an edit button that will eventually give you a place to add the pictures. it’s not very intuitive, and slightly different results for web vs. mobile. I don’t remember which is better.

  • Corinne posted a new activity comment 3 months ago

    3 months ago
    3 months ago

    unfortunately on the mobile app photos are cropped oddly and only one and a partial are visible. you can add more photos to the post, each piece on its own would be best.

  • Corinne posted a new activity comment 3 months ago

    3 months ago
    3 months ago

    Looks like one of the many fakes that come out of Morocco. often the teeth are real but the rest is faked. The bone here is too flat and oddly textured, and the teeth spacing and order doesn’t make sense. There’s a good writeup at fossil era (I don’t know them as a business, just like the…[Read more]

  • Corinne posted a new activity comment 7 months ago

    7 months ago
    7 months ago

    is it lightweight and porous? looks like a deer “toe” bone

  • Corinne posted a new activity comment 8 months, 3 weeks ago

    8 months, 3 weeks ago
    8 months, 3 weeks ago

    worn horn coral

  • Corinne posted a new activity comment 8 months, 3 weeks ago

    8 months, 3 weeks ago
    8 months, 3 weeks ago

    @jaqui-zehr I wouldn’t break it. you can see that the interesting part is a coating around something harder in the middle. Middle rock doesn’t look interesting, and you’d likely destroy the piece.

  • Corinne posted a new activity comment 8 months, 3 weeks ago

    8 months, 3 weeks ago
    8 months, 3 weeks ago

    Gryphaea maybe? The sharp curl on the one makes me think so, and also Gryphaea are pretty common. But it looks like maybe an internal mold, without the ridges/striations that seem to be common on Gryphaea.

  • Corinne posted a new activity comment 8 months, 3 weeks ago

    8 months, 3 weeks ago
    8 months, 3 weeks ago

    The fan shaped outlines are the sutures where the new chambers were added to the shell.

  • Corinne posted a new activity comment 8 months, 3 weeks ago

    8 months, 3 weeks ago
    8 months, 3 weeks ago

    looks like calcite that formed over a softer mineral which then eroded away. I have pulled similar looking bits off the end of crystals I was collecting.

  • Corinne posted a new activity comment 1 year, 1 month ago

    1 year, 1 month ago
    1 year, 1 month ago

    really nice coral. can’t help with age

  • Corinne posted a new activity comment 1 year, 1 month ago

    1 year, 1 month ago
    1 year, 1 month ago

    Agatized wood is a thing. It’s a beautiful piece.

  • Corinne posted a new activity comment 1 year, 2 months ago

    1 year, 2 months ago
    1 year, 2 months ago

    Not a fossil, but a nice piece with quartz or calcite crystals. To tell which it is you can find an inconspicuous place to scratch or drop an acid (vinegar is ok, I find lemon juice sometimes works better). Calcite will scratch or fizz, quartz will not. Sometimes it’s easier to hear it fizzing than see it.

  • Corinne posted a new activity comment 1 year, 2 months ago

    1 year, 2 months ago
    1 year, 2 months ago

    nice ammonite

  • Corinne posted a new activity comment 1 year, 2 months ago

    1 year, 2 months ago
    1 year, 2 months ago

    Any more info like location or how you got it? Reminds me of Helicoprion but that’s very much a guess on my part.

  • Corinne posted a new activity comment 1 year, 2 months ago

    1 year, 2 months ago
    1 year, 2 months ago

    For sure not an embryo. Looks like a very worn horn coral.

  • Corinne posted a new activity comment 1 year, 3 months ago

    1 year, 3 months ago
    1 year, 3 months ago

    Not a horn coral. May be an internal cast of an oyster. Looks like possible shell imprint also (ridges on bottom center of first picture).

  • Corinne posted a new activity comment 1 year, 3 months ago

    1 year, 3 months ago
    1 year, 3 months ago

    Look at bubblegum agate. I wouldn’t call this exemplary of it, but I think it’s a good match. If you are in Rapid City the university (? been a few years) museum has nice examples of agates and other minerals, and possibly people who can identify for you.

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