tag:blogger.com,1999:blog-5192250381057989170.post3548612680869617902..comments2024-03-26T16:53:48.618-06:00Comments on In the Company of Plants and Rocks: Anybody recognize this famous outcrop/roadcut?Hollishttp://www.blogger.com/profile/10788942181934895493noreply@blogger.comBlogger5125tag:blogger.com,1999:blog-5192250381057989170.post-54183810491983434192014-10-13T11:52:56.196-06:002014-10-13T11:52:56.196-06:00I've spent countless hours in the Bear Lodge M...I've spent countless hours in the Bear Lodge Mountains, but have not been back since '93. One of my favorite geological areas by far. I have a few pics of the BLM posted on my website: www.12stoneconsulting.com including one of the very same outcrop back in the day.Anonymoushttps://www.blogger.com/profile/15083454724423720470noreply@blogger.comtag:blogger.com,1999:blog-5192250381057989170.post-59881894661094237372014-05-20T07:32:20.242-06:002014-05-20T07:32:20.242-06:00Thanks for reading and glad you visited the dike! ...Thanks for reading and glad you visited the dike! It crosscuts trachyte porphyry of the central part of the Bear Lodge intrusion as well as the huge granite xenolith mentioned above. I should have added the "answer" to this geo-challenge once it was up ... there's now a link at the end. I also included more explanation in that post:<br />http://plantsandrocks.blogspot.com/2012/08/the-not-so-famous-outcroproadcut-is.html Hollishttps://www.blogger.com/profile/10788942181934895493noreply@blogger.comtag:blogger.com,1999:blog-5192250381057989170.post-44883896301378911572014-05-19T21:01:56.679-06:002014-05-19T21:01:56.679-06:00Thanks! We spent the weekend over Mother's Da...Thanks! We spent the weekend over Mother's Day 2014 up there. I rode my bike near this outcrop. I knew it was a Tertiary phonolite porphyry. The phenocrysts are a feldspar and it is cutting through the Cretaceous Lakota Fm? signed Anonymous geo from Casper, WYAnonymousnoreply@blogger.comtag:blogger.com,1999:blog-5192250381057989170.post-54673868482164317222012-08-17T14:45:55.755-06:002012-08-17T14:45:55.755-06:00Right on, Ron! I'm at the Sundance library ag...Right on, Ron! I'm at the Sundance library again, throwing together an answer post ... should be up soon.<br /><br />Thanks for the Comment.Hollishttps://www.blogger.com/profile/10788942181934895493noreply@blogger.comtag:blogger.com,1999:blog-5192250381057989170.post-56801915945819047652012-08-15T21:23:48.335-06:002012-08-15T21:23:48.335-06:00Well, I didn't recognize it, but I sure did lo...Well, I didn't recognize it, but I sure did locate it in Google Earth. It's near the summit of Bear Lodge Mountain. I'd put your thumbtack location at 44.4747N, 104.4419W. I presume the dike is made of similar material to the Tertiary porphyritic phonolite that constitutes Devils Tower (they certainly share a similar porphyritic texture, in any case). Not certain what the country rock is since my Black Hills geologic map is still packed away in storage, but given the location I'd imagine its either one of the Paleozoic (or lowermost Mesozoic) units of the Black Hills uplift.<br /><br />How'd I do?Ron Schotthttps://www.blogger.com/profile/10020094512548523216noreply@blogger.com