Video Glossary: Omar скачать в хорошем качестве

Video Glossary: Omar

These are three stones that are examples of the process of an omar forming, or the- a circular depression in the stone that looks like it could be something that somebody made, but it's in fact a natural hole. And it might start in a material such as a sandstone or a greywacke with some sort of a softer inclusion that's formed in the rock. And you can see here this is a calcium carbonate inclusion. You can see that the edges are already eroding out, and at some point, this is going to pop out of the stone and it's going to leave a cavity like this. Now, this cavity is kind of rough and irregular in shape, but if this is in a water area, if it's in a river and a little stone gets caught in there as the water is running over, the little stone is going to run around in there and polish that into a nice sphere. It's going to make a little, small pothole. It can make a really big pothole in some areas. But all of these are natural formations. Links for further information: Related MVAC webpages: -Ground Stone Tools: https://www.uwlax.edu/mvac/educators/... -Lithics: https://www.uwlax.edu/mvac/educators/... Related MVAC videos: -Groundstone Tools vs Natural Stones – MVAC’s Dr. Connie Arzigian explains how to differentiate stone shaped by people through processes such as grinding and battering from naturally worn stone, including omars:    • Groundstone Tools vs Natural Stones   Other useful resources: -“Geology of Interstate Park The St. Croix Dalles Home of the World’s Deepest Potholes” – article by Dave Crawford, Joe Niznik, Keith Leaman, Tony Rix, Kacie Carlson, and Ron Miles on the potholes (think omars on a much larger scale) and broader geology of Interstate State Park in Minnesota: https://files.dnr.state.mn.us/destina... -Interstate State Park, Minnesota – find out more about Interstate Park on the Minnesota side of the St. Croix River: https://www.dnr.state.mn.us/state_par... -Interstate State Park, Wisconsin – learn about visiting the park on the Wisconsin side of the St. Croix and seeing potholes formed by glacial meltwaters: https://dnr.wisconsin.gov/topic/parks... and https://dnr.wisconsin.gov/topic/parks... -“Omarolluk” Wikipedia page with references: https://en.wikipedia.org/wiki/Omarolluk Credits -Judy Crook generously provided the omar examples featured in this video. Artifact Identification Mississippi Valley Archaeology Center at the University of Wisconsin–La Crosse works mainly in Wisconsin, Minnesota, and Iowa and can provide information related to that region. If you would like information on artifacts, email a description of the item and where it was found, and attach a picture of the artifact with a scale to show its size. For more information visit MVAC’s website at: https://www.uwlax.edu/mvac/contact/. For information on other regions, we suggest contacting the appropriate state archaeologist from the following list: https://sites.google.com/view/state-a....