Description: From Fierstein (2007): "A thin (up to 1 cm) pale orange very fine ash (sample K-2500F) stands out in distinct contrast with the dark silty soil in which it is locally preserved ∼45 cm beneath the "lower ash rib". Better preserved in the lower VTTS, it is as thick as 4.5 cm in Bush Creek, where it is dark greenish-orange and still very fine. In Moraine Creek, too, a 3-cm-thick greenish-orange ash in the same stratigraphic position is likely correlative with this unit, although no microprobe data are in-hand to be sure. Glass data that are available show this tephra is relatively mafic (56-62% SiO2; Fig.13 [in original text]), and most magnetites are relatively high in MgO, with a distinctive trend similar to that of the upper grey ash. Because both glass and magnetite data are similar to those of the upper grey ash and are distinct from other Martin, Mageik, and Katmai tephra, this ash layer is suspected to have been derived from a source on Mount Peulik. A radiocarbon date on peat beneath the ash in Angle Creek yields 7,890+/-120 14C B.P., and peat beneath the (probably) correlative ash layers in Moraine Creek yields 7,440+/-120 14C B.P. and in Willow Creek 7,700+/-120 14C B.P."