placerville Posted August 14, 2019 Share Posted August 14, 2019 I found this sandstone slab on our property in south west Colorado, near Placerville, and was struck by the spider like creature especially. There also seems to be a mollusk nearby this creature. But its legs would have been so fragile, hard to imagine how it could be a fossil. But it doesn't seem like just a random shape to me. Any thoughts? I had to reduce the pictures quite a bit to fit size requirements here. 1 Link to comment Share on other sites More sharing options...
jdp Posted August 15, 2019 Share Posted August 15, 2019 Exactly where near Placerville. Link to comment Share on other sites More sharing options...
jdp Posted August 15, 2019 Share Posted August 15, 2019 To clarify, what was the outcrop? The rocks in the Placerville area are mostly terrestrial in origin but span a long period of time. Link to comment Share on other sites More sharing options...
placerville Posted August 15, 2019 Author Share Posted August 15, 2019 Southwest Hastings Mesa, near Alder Creek fault, (per hydrologist's map), thank you Link to comment Share on other sites More sharing options...
placerville Posted August 15, 2019 Author Share Posted August 15, 2019 By outcrop I guess you mean? It was on the trail, loose, as I came down the hill Link to comment Share on other sites More sharing options...
jdp Posted August 16, 2019 Share Posted August 16, 2019 You have pictures of the site? Link to comment Share on other sites More sharing options...
placerville Posted August 16, 2019 Author Share Posted August 16, 2019 It's on an old logging trail/road, very steep. I marked an x where I think I picked it up- just a loose slab like so many on the trail. Our community is looking to place a well, that's why I have the specific map. I have a bigger geo map but not sure if I should post it, could send it in message. The second image is another possible fossil found on same trail. The central vein, (if that's what it is), is raised. The third image is of this trail which is steeper than image suggests with rocks scattered all over it. Thanks for your interest. Link to comment Share on other sites More sharing options...
jdp Posted August 17, 2019 Share Posted August 17, 2019 So I think that what you're seeing is root casts. I'm not totally sure, but I'm having a hard time making it into anything else. I'd be okay with that being Brushy Basin Member Morrison Formation...I've seen similar types of rocks in that area and elsewhere in the region. I was just curious about location because I've done some field work in your immediate area but relatively far down-section. Link to comment Share on other sites More sharing options...
placerville Posted August 17, 2019 Author Share Posted August 17, 2019 Well that's certainly interesting, thank you, jdp. Admittedly I was hoping it was from an inland sea! Also interesting that you know this location so well. I know they discovered Oradectes sanmiguelensis somewhere nearby and about 4 years ago I learned somehow that some research was going on I think near the river here during that summer in a fairly inaccessible place (of which there are many of course.) Anyway, thanks again. I'm an artist, not a geologist, but I have a good eye for patterns in nature. Link to comment Share on other sites More sharing options...
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