DMNH 644 is the most comprehensive excavation in the Velvet Room, with more than 2 m of stratified material excavated. Paleomagnetic dating indicates that horizons A-C are younger than the Brunhes-Matuyama boundary, which dates to about 780 Ka; horizons D and below appear to predate 780 Ka. Horizon A is composed of a modern assortment of packrat fecal pellets, bone, and plant material. Horizon B is a rich brown layer. Horizon C is gray in color. A tan layer, horizon D, lies atop a brown laminated zone, horizon E. Horizons F-K subdivide a rocky, light brown layer. As one progresses down, horizons L-R become progressively redder. Wood rats seem to have been a major taphonomic agent in this locality, although fluvial deposition is evidenced by the presence of intact, freshwater snail shells in some horizons. In general, however, the strata are layered in a talus cone, the apex of which is near a purported sealed entrance into the room. (See chapter 2 for additional details.)
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