During description of the core, cooling units were identified and numbered sequentially down the hole. The unit numbers designate the core box in which the unit first appears. Contacts were drawn at the tops of individual pillows and at massive basalt flow margins. Among the secondary minerals that occur throughout the section, chlorite and smectite were impossible to distinguish in the field and are listed usually as layer silicates. Individual zeolite species could only rarely be distinguished in hand specimen. Estimates of groundmass alteration were made from hand specimens and are approximate at best.