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Does anyone know what these are? The previous owner forgot where they were found but thinks they are from the Fox river in Illinois. Can anyone confirm this? They look like plant fossils similar to those found at Mazon creek. Thanks.
Part-timer here, always like to look at your beautifully preserved specimens! I collected a number of concretions and recently have had some time to hone my prepping skills....Some of the ammonites I am working with have an awesome mother-of-pearl look to their shell which tends to fade, dry and flake over time. What will preserve them? Is there something that I can do to them before air abrasion to avoid fracturing them? Here's a couple of pics.....my technique has been smash the concretion with a big hammer then look for specimens to work with, is there a better way?