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Any rock hounds ?
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<blockquote data-quote="Ristorapper" data-source="post: 291834" data-attributes="member: 810"><p>Similar to the "cannonball" concretions found in the Cannonball Formation (Paleocene era) that are quite common around the Bis/Mandan area. You can see these and much, much bigger ones some years when the water is down near the confluence of the cannonball river and Missouri river. If you look up into the sedimentary formations at the cliff there you may see these concretions sticking out. Once eroded they will roll down the cliff to the shoreline there. You can see some that were collected and placed at Harmon lake north of Mandan. You see some of the bigger "cannonballs" around town in yards, some in area farm yards. Googled the Cannonball Formation and found an article from ONE of my professors at UND; Alan Cvancara, interesting. </p><p></p><p><a href="https://www.dmr.nd.gov/ndgs/Publication_List/pdf/RI%20SERIES/RI-57%20ADD%20PLATES.pdf" target="_blank">https://www.dmr.nd.gov/ndgs/Publication_List/pdf/RI SERIES/RI-57 ADD PLATES.pdf</a></p><p></p><p></p><p><a href="https://www.onlyinyourstate.com/north-dakota/rock-formation-nd/" target="_blank">https://www.onlyinyourstate.com/north-dakota/rock-formation-nd/</a></p><p></p><p><a href="http://archives.datapages.com/data/ndgs/data/008/023/023.html" target="_blank">http://archives.datapages.com/data/ndgs/data/008/023/023.html</a></p><p></p><p>lol tell me if you've had enough!!</p><p></p><p><a href="https://www.dmr.nd.gov/ndgs/documents/Publication_List/pdf/Strat-column-NDGS-(2009).pdf" target="_blank">https://www.dmr.nd.gov/ndgs/documents/Publication_List/pdf/Strat-column-NDGS-(2009).pdf</a></p></blockquote><p></p>
[QUOTE="Ristorapper, post: 291834, member: 810"] Similar to the "cannonball" concretions found in the Cannonball Formation (Paleocene era) that are quite common around the Bis/Mandan area. You can see these and much, much bigger ones some years when the water is down near the confluence of the cannonball river and Missouri river. If you look up into the sedimentary formations at the cliff there you may see these concretions sticking out. Once eroded they will roll down the cliff to the shoreline there. You can see some that were collected and placed at Harmon lake north of Mandan. You see some of the bigger "cannonballs" around town in yards, some in area farm yards. Googled the Cannonball Formation and found an article from ONE of my professors at UND; Alan Cvancara, interesting. [URL]https://www.dmr.nd.gov/ndgs/Publication_List/pdf/RI%20SERIES/RI-57%20ADD%20PLATES.pdf[/URL] [URL]https://www.onlyinyourstate.com/north-dakota/rock-formation-nd/[/URL] [URL]http://archives.datapages.com/data/ndgs/data/008/023/023.html[/URL] lol tell me if you've had enough!! [URL]https://www.dmr.nd.gov/ndgs/documents/Publication_List/pdf/Strat-column-NDGS-(2009).pdf[/URL] [/QUOTE]
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