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Just moved 40 to the SE of Yellowstone National Park in NW Wyoming. We have been finding these in the excavation of the house. They are located in a greenish clay layer just above a rocky layer approximately 12 feet below the surface. They are sedimentary balls that, when broken open, have a smaller, more hard type of rock or maybe fossil inside. We find them in different sizes from 4-12 inches in diameter. Any help would be much appreciated. Edit - I believe they are rare double concretions.

Scientists decipher the magma bodies under Yellowstone Computer modeling shows the presence of a thick crustal transition zone that may control the movement of magma emerging from the Earth's mantle, University of Oregon https://www.sciencedaily.com/releases/2018/04/180416185610.htm The paper is: D. P. Colón, I. N. Bindeman, T. V. Gerya. Thermomechanical modeling of the formation of a multilevel, crustal-scale magmatic system by the Yellowstone plume. Geophysical Research Letters, 2018; DOI: 10.1029/2018GL077090 https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2018GL077090 Yours, Paul H.

Lowenstern, J.B., 2005, Truth, fiction, and everything in between at the Yellowstone Caldera. Geotimes, v. 50, no. 6, pp. 18-23. http://www.agiweb.org/geotimes/june05/feature_supervolcano.html Lowenstern, J.B., 2005, Truth, fiction, and everything in between at the Yellowstone Caldera. Yellowstone Science. (Reprinted from Geotimes) v. 13, no. 3, pp. 15-20 https://web.archive.org/web/20170130171721/http://www.colorado.edu/geography/class_homepages/geog_1011_f09/geog_1011_r1.pdf https://web.archive.org/web/20161204103602/https://www.nps.gov/yell/learn/upload/YS_13_3_sm.pdf Yellowstone Science: Past Issues https://www.nps.gov/yell/learn/yellowstone-science-issues.htm https://www.nps.gov/yell/learn/yellowstone-science.htm Yours, Paul H.

Greetings all! Im a newish member to your site and am grateful to have such an amazing resource available for up and coming enthusiasts like myself. This summer,my family has planned a trip to yellowstone and the black hills. My kid sister is an avid fossil nut like myself and we are eager to get down in the dirt. Since we've never been out west before, i was hoping to get some pointers on destinations we should consider.... I'd like to keep as close to the interstate 90 and interstate 80 corridors as possible, so as not to further inconvenience the rest of my family. Cramming everyone into one car will provide enough frayed nerves as it is, and i'd like to keep the stress to a minimum - any suggestions on things near fossil sites that i could send my siblings to would be excellent, every diversion will help! Also, i've read a few pages that suggest acquiring a fossiling permit? Is this legit? Most pages have informed me that vertebrates are off limits but i can dig around on any roadside for invertebrates to my hearts content. Im from Pennsylvania and our state has spoiled us for fossiling, as far as not requiring permits... I've heard that fossil quarries are a great place to go, if pricey - and im considering going to one of those - any suggestions on which? My sister really wants a fish fossil and the results seem to be good at the pay quarries, i was just wondering what the likelihood of hitting pay dirt is... oh, and has anyone been to cycad national park/monument (not sure which one it is, a park or a monument) ? Is it worth the stop? Any help would be greatly appreciated! Cheers!