Strange concentric structure in Marly sandstone upper Miocene.

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Javier Martínez-Salanova

It's very difficult to tell anything from photos; it could be anything. For example, bioturbation that serves as nucleus for Liesegang rings.

Mahdjoub Abdalhak

I really appreciate your response, I found this paper talk about structure that almost looks like the same.

"Unusual Sandstone Cylinders from the Lower Permian Glorieta Sandstone, Northern New Mexico"

Spencer G. Lucas1, William A. DiMichele2, and Joseph M. Karnes3 1 New Mexico Museum of Natural History and Science, 1801 Mountain Road NW, Albuquerque, NM 87104; [email protected] 2 Department of Paleobiology, Smithsonian Institution National Museum of Natural History, Washington, D.C. 20560; [email protected] 3 Joseph M. Karnes, P.O. Box 2980, Santa Fe, NM 87504; [email protected]