1996 Current Research in the Pleistocene 13:55-57. Microwear Analysis of Chipped Stone Tools from the Martins Creek Mastodon Site, Holmes County, Ohio Nigel Brush and Richard W. Yerkes In lhe summer of 1993, excavations al the Martins Creek Ma5Lodon site in Holme3 C-Ounty, Oruo, rerulted in the recovery of several flint flakes and scrapers in as$ociation with mastodon [Mammul ammcanum) and deer bones (Brus.h & Smith 1994) . The presence of the flint flakes immediately brought to mind the experimental work of Nicholas Toth (1987) on the value of £1ake1 .u but.chering tools. two scrapers from the Maniru Creek site were submi u.ed Lo Margaret Newman al !.he U niversi.ty of Calgary for immuno- logical analysis of possible blood residues . Two of the flint flaRcs gave positive resull:.!l-one for elephant anc:isera and one for deeranrisera (Bro.sh, Newmim, &Smith 1994) . These flakel and scrapers, plus an additional five flint artifacts, - were rub3equently rubrnitted to Bruce Hardy at Indiana University for DNA Unfortunately, poMible DNA residues on the too.15 could not be sequenced because of their poor state of preservation (Hanty pers. comrri.}. Afu:r t.he immunological and DNA analyses were completed, the fill.es and scrapers fromMartiru Creekweresubmitted to Richard Ycrk.e$at the Ohio State University for m.krowear analy3is. These artifacl3 included: avo liide/ end scrapers, one biface fragmenL, one retouched fllie, and six uoretouchedflakes. They were deaned in an uirrasonic cleaner with "Top Job" detergent; a 10% solurion of HCL, and a 30% solution of Hp!. Microscopic examination was _ conducted with an Olympus metallurgical · microscope under incidentlightatmagni.fications between 50xand 1500x. This rechruque h often referred to as the "high-power approach" al'io is conlrast.ed Nigel Bruth, Genier for EnviroamenlAI Stud.Jes, The of Akn>n. Akron, OH Rich3rd W. Yerkes, of AnLhropology. Ohio Univ...-Jity, Columbm, OH -4!210.