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Hunting spots unfortunately come and go. And so it will be with the site I visited this week having been one of my favorite local spot for Decorah Shale fossils it saddened me to see construction taking it away from me. So I hunted it hard and it produced fairly well. First up are a few hash plates. There was a discussion this week on whether fossils should be left in matrix or not. I decided to provide a little of both There seems to be two types of rugosa coral. One is very smooth. The other has rough ridges. The only species name I have for the Decorah is Lambeophyllum profunum, which I feel is the smooth one. I found dozens of Strophomena but have a difficult time differentiating the various species based on the look of one side of one shell. So I didn't bore you with many pictures of this genus. These are worm burrows, very common in the Decorah. I find these on occation and call them sponges. It is a ball with a stalk that seems to have attached to something. Maybe it is just a common Prasapora bryozoan. This was one of my favorite finds of the day. Gastropods in the Decorah are not pretty. The Platteville below and the Galena above produce many nice gastropods. If anyone knows an explanation, I would love to hear it!! This is your typical Prasapora bryozoan of the Decorah. Two species are mentioned without a description of how to tell them apart. This next species of Prasapora is easy to tell apart. But is uncommon to find. I was ecstatic to grab two in the same trip!! This picture speaks of how easy it is to ID a P. grandis from the others!! Now I must tearfully say goodbye to this site. But construction continues to boom in the area and new exposures will likely show up. Mike
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- 18
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- decorah shale
- minnesota bound
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