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I was collecting isorthoceras cephalopods at Graf Iowa (Elgin Member of the Maquoketa Formation, upper Ordovician). I found one partial specimen that in cross-section is about 8-9 times larger than any other I’ve found there. This first pic is from the field. (Don’t worry, the next photos have a scale cube in them!) The large specimen is about 8.9 cm by 5 cm. You can see cross sections of the usual-size isorthoceras in the rock (filled and infilled), and they’re closer to 1 cm across. Unfortunately, the specimen is fairly fragile. I’ve already had t
tombk posted a topic in Fossil Hunting TripsThis is my first post of a Fossil Trip I took. I'm also fairly new to identifying fossils and researching the geological makeup of various sites. The trip was fun and writing about it really helped me organize my finds. (Sorry to use a sharpened pencil to indicate size. I want to get one of those cool metallic-looking cubes I see on TFF. If somebody can tell me where to get one, I'd be very grateful.) I recently went on vacation about 8 miles East of Galena, Illinois. I had checked with a few local and regional rock and fossils groups to see whether anybody knew of collecting sites
Last Autumn, I took a side trip to Graf, Iowa in search of it's "elusive" cephalopods. Fortunately for me, a large piece of rock had released itself from the overhanging cliff and I proceeded to use my sledge hammer on it until broken into eight 50 lb pieces. This then was loaded into my truck without further exploration as I knew, each chunk contained maybe 50 cephalopods within it. These chunks of matrix were to provide me with a little winter entertainment while the landscape of Minnesota remained white. Two weeks ago I began splitting these boulders, looking for the treasure
I have been to Graf, Iowa three times in the last 10 years and am always amazed at this site with the shear number of cephalopods exposed in the rock face. This fourth trip was made to find some material for a forum member. In doing so, I took the time to look closely at the matrix present at Graf. There were gastropods, brachiopods, bivalves ,graptolites, and even trilobites hidden in the rock. I had never noticed this on my previous trips since the cephalopods are overwhelming. I would love to go back another time soon and NOT look at the cephalopods at all, to see what I could find. I am h