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i <br /> University of Wisconsin <br /> i <br /> RIVERFALLS River Falls, Wl 54022 <br /> Department of Plant and Earth Sciences <br /> College of Agriculture <br /> 7151425-3345 <br /> FAX 4 7151425-3785 <br /> August 29, 1991 <br /> Neil Sprague <br /> Arkins Park Stone Co. <br /> 5975 N. County Road 27 <br /> Loveland, CO 80538 <br /> Dear Mr. Sprague: <br /> On behalf of the Geology faculty of the Department of Plant and Earth Science, <br /> University of Wisconsin-River Falls, I'd like to thank you for your donation of <br /> fossil specimens for use in our teaching collection. The two beautiful spe imens <br /> which you donated in July 1991 are fascinating and will make a valuable addition to <br /> our trace fossil collection. I am sure they will generate a lot of discussion. <br /> I have enclosed two articles you may find interesting. The first, by Walker and <br /> Harms, although fairly technical, is the classic work dealing with the Lyon <br /> Sandstone. Note mention of fossil trackways on page 283. I haven't check ad the <br /> original literature on the "Scorpionid" tracks to see if they match your trac ways, <br /> but your other specimen is a reptile track. The second article just came oul and <br /> illustrates tracks just like those in your quarry. I'll keep you in touch as I learn more <br /> about these trackway sites. <br /> I have estimated the value of the fossil specimens based on prices quoted b <br /> commercial dealers for similar material (Geol()gical Enterprises, Inc.). I would <br /> estimate the value of the reptile trackway at $200 and the "insect" track at 1100. <br /> I <br /> Again, thank you for your generous donation. <br /> Sincerely, <br /> Michael D. Middleton, Ph.D. <br /> Associate Professor - Geology <br /> enclosures <br /> jfk <br />