TO: Tom Davies

FM: Carlos A. Alvarez Zarikian

JA Daily Science Report for Expedition 306, 4 April 2005.

LOCATION: En route to Site U1314 (GAR-1B)

SCIENCE UPDATE:

The lithology at Hole U1313D mirrors that of Holes A, B, and C: brownish (10YR 8/3, 10YR 7/3, 2.5Y 7/4) sediments at the top  transitioning into ominantly medium light gray (N6), with light olive gray (5Y 6/2), light gray (5Y 7/1), olive yellow (5Y 6/6), greenish  (5Y 6/3) mm-cm thick laminae downhole to Core 14H, and predominantly white (N9) thereafter. Sediments are primarily composed of nannofossil ooze, foraminifer nannofossil ooze, and foraminifer nannofossil ooze with clay. An ash layer was documented in the four holes at Site U1313 at about 33 mbsf. The Matuyama/Gauss boundary was recognized at 33.8 mbsf and the Jaramillo normal polarity zone between 41.2-45.8 mbsf in  Hole U1313D. An excellent high resolution record was recovered from Site U1313 and two complete stratigraphic sections were composed: one to 300 mbsf, representing the last 5.5 Ma, and the other to 160 mbsf, representing the last 3.5 Ma.