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Mastodon tooth found in Michigan creek by 6-year-old boy
Oxytropidoceras posted a topic in Fossil News
Mastodon tooth found by 6-year-old on a hike. He’s donating it to the University of Michigan Michigan Live, September 30, 2021 Rare mastodon tooth found in Michigan creek by 6-year-old boy By Megan Woods, WDIV, October 4, 2021 4:06AM Six-year-old boy discovers rare 12,000-year-old Mastodon tooth in Michigan creek Firstpost News, October 06, 2021 6-year-old boy finds historic mastodon tooth in Rochester Hills creek Tooth will be donated to University of Michigan’s Museum of Paleontology for research Yours, Pau- 2 replies
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- dinosaur hill nature preserve
- rochester hills
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I had to make a trip to the "big" city of Rochester, Mn today. As I drove by a new building site that exposed some Decorah Shale, I had to make a stop. The Decorah Shale is an impervious layer that keeps pollution from seeping into deeper rock layers and contaminating our ground water. Obviously, building permits are being obtained without adherence to the zoning which prevents interuption of this great geologic feature! I will drink my own water but collect fossils from these ill conceived sites. While visiting such a site, I discovered this tiny gastropod that I can not identify.
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- gastropod
- decorah shale
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Rhynchonellids are hard to identify by exterior morphology as they often need to have their internal structures visible to be sure of an id. However if you know the faunal lists from a specific area, you can reduce the candidates considerably. The specimen here has 22 costae with 4 on the fold and thus, at this size must be one of two species, Rostricellula minnesotensis or Rhynchotrema wisconsinensis. The only completely safe way to differentiate between the two is the presence or absence of a cardinal process in the brachial valve but this is not possible here. However, Rostricellula usuall
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As with the adult this has more costae than any other brachiopod found in this formation. In this case 32. and 5 of them on the fold. The fold and sulcus are not yet very noticeable, as this species only develops a noticeable fold as it matures.
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- rhynchotrema ainsliei
- rhynchotrema
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Brachiopods, perhaps rhynchonellids most of all, are notoriously hard to identify without their internal features exposed. However, if you know the formation and rough location and have faunal lists it can be possible. Rhynchonella ainsliei, for example, has 26-34 costae with 5-7 of these appearing on the fold. This specimen has 30 and 5 respectively and is the only species that has so many found in this formation. It also has the correct shape and size to support the match.
