Event Name : Martin Lower Pale Tan Ash
|Start: 3700 || Years BP Tephrochronology || |
From Fierstein and others (2007): "Between the lower grey ash and ODLF marker beds (discussed above: K-2500J and H in this section) is a thin, discontinuous pale tan ash represented by sample K-2500i. Compositionally similar (only slightly more silicic) to the distinctive salt and pepper ash (K-2500K; Fig. 13 [in original text]), it seems likely that layer "I", also came from nearby Mount Martin, especially as this layer has not been found anywhere else. Layer "I", 6 cm beneath K-2500J, but 30 cm above K-2500H is slightly older than (our preferred age of) ∼3,600 14C year B.P., but probably much younger than ODLF, which has an age of ∼3,800-4,000 14C year B.P. Because ~400 14C years separates the lower grey ash from the ODLF unit, and the lower pale tan ash ("i") is about 1/6 the distance between them, the best estimate for a deposition time for this ash is ∼3,700 14C years B.P."