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Found this in San Miguel county, western Colorado. USGS layer says it's Dakota Sandstone and Burro Canyon formation out there. This stood out because it wasn't just a flat blocky rock. I thought it looked like it came out of one of those playdoh things where you squished the stuff through and got a star shaped rope or a bunch of spaghetti. But it's all sandstone and when I cleaned it up I see it's got some kind of mineralization on it. Whatever it is it's resting on a slightly different type of sandstone that I tried to show in the 2nd photo. Limb cast sandstone wood rreplacement?
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Still learning my formations. Found these close to the bottom of the Dakota Sandstone formation in Kansas.
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Yesterday (Saturday, Aug. 22nd), I went fossil hunting in Ellsworth County, Kansas again for elusive Dakota Sandstone leaves and unfortunately it's mostly a bust, just like the previous trip. Despite that, I enjoyed the scenery and found some odd rocks and few fossils from new sites. A new site produced a few small plates containing woody and plant material fragments. I decided not to keep them. Closer views... Remember that interesting sandstone from the previous trip? I regretted for not taking it home so I took another opportunity and revisited the old site to get that rock! The back of this rock is quite smooth and flat, I think it would be great to have it hang up on the wall, but I'm actually not sure how I will display it. Looking at it is like reading a 3D map! It's the only object I brought home from this trip. It's peaceful out there and the views of the Smoky Hills never gets old. ...continued on the next post.
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Like what title said: is it a tree limb, bamboo, reed, or is it even something geological? Dakota formation, also known as Dakota Sandstone. Dakota formation is known to produce variety of flora fossils, such as leaves and seeds. The patterns on these fossils strike me as 'flora-ish'; like these that seem be nodes and also 'bark-like' and fibrous textures. ...Continued on the next post.
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I'm wondering if it's a fossilized burrow or some form of ichnofossil. Notice the depression from the opposite side of the burrow-like projection. Dakota Sandstone formation and Cenomanian in age.
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I'm wondering if it's really the petrified woods. It's found in ironstone concretions from Dakota Sandstone (Cenomanian), and it strikes me as 'woody'. I'm interested in what others think. From different trip and different site few months ago, but same formation and age.
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Finding the fossilized leaves from Dakota formation (also known as Dakota Sandstone) has been one of my goals for a long time. Today I headed to Ellsworth County, Kansas, where the Dakota Sandstone are located and hunt for the fossilized leaves. Unfortunately it's mostly a bust, but I did find a couple possible wood fossils and a few interesting rocks. I didn't take anything home this time except some pictures and memories. Notice the trees following along the small stream. Interesting sandstone! Interesting ironstone concretion! ...Continued on the next post.
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At first I thought it might be the cross-section of petrified trunk but upon a closer inspection, I doubt it's petrified woods. It is not silicified. I wonder if it's a concretion or Liesegang rings? I don't think I have seen something like this in person before. I couldn't get it extracted because it's embedded in the bedrock.
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Lit.: S.K.Samsonov (1967) Betulites Goeppert, Upper Cretaceous of Kazakhstan and North America. International Geology Review 9(2):218-219. DOI: 10.1080/00206816709474457 Robert W. Baxter (1954) The University of Kansas Collection of Fossil Plants. I. The Dakota Sandstone Flora. Transactions of the Kansas Academy of Science (1903-) Vol. 57, No. 1 (Mar., 1954), pp. 41-47 (7 pages)
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