Southeastern Section - 54th Annual Meeting (March 17Ė18, 2005)
Paper No. 6-6
Presentation Time: 8:00 AM-12:00 PM


FREDERICK, Daniel L., Department of Geology and Geography, Austin Peay State Univ, P. O Box 4418, Clarksville, TN 37044, and DEIBERT, Jack E., Department of Geology and Geography, Austin Peay State Univ, P.O. Box 4418, Clarksville, TN 37044

A human mandible from an anonymous mail package was the central piece of physical evidence in a 1996 homicide in the Clarksville, TN area. Several hundred natural sediment grains were recovered from the mandible. Two previously mailed anonymous letters received by police indicated the victimís remains could be found in a creek in the Gallatin, TN area, some 70 km away from the victimís last known location in Clarksville. Local investigators asked for assistance in determining the origin and location of the sediment.

Sediment from the mandible consisted of grains of siltstone, chert, fossil biogenic material, and quartz ranging in size from 0.06 to 4.5 mm in diameter. Lithologic and textural characteristics suggest the sediment was locally derived from Mississippian through Ordovician sedimentary rock formations found in the Central Basin of Tennessee. The composition is similar to stream sediment from the Gallatin region. In particular, gastropod fossils, dolomitic siltstone, and phosphatic siltstone grains are similar to those found in the creeks of that area.

Comparison of the mandible samples with stream sediment from the Clarksville area exhibited consistent differences in rock composition and fossil biogenic content. These differences indicate that it is highly unlikely the sediment recovered from the mandible originated from rock formations in the Clarksville area which are entirely Mississippian in age.

The analysis established the mandible sediment was distinctive enough to serve as a forensic tool and was used to obtain a search warrant of a suspectís residence and to better define search areas to locate the remains of the victim. During the criminal trial, prosecutors used the sediment analysis to establish that the original location of the victimís remains was consistent with the location given in the two anonymous letters. Additionally, since no other remains of the victim were found, the provenance of the mandible sediment helped prosecutors establish the victimís death was a homicide.

Southeastern Section - 54th Annual Meeting (March 17Ė18, 2005)
General Information for this Meeting
Session No. 6--Booth# 22
Sedimentary Geology and Paleontology (Posters)
Bayview Hotel at the Grand Casino Resort: Grand Ballroom D
8:00 AM-12:00 PM, Thursday, March 17, 2005

Geological Society of America Abstracts with Programs, Vol. 37, No. 2, p. 11

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