The base of a basalt lava flow is seen some 30 cm below the hammer head. The lower part of the flow shows elongate vesicles (gas bubbles), which may have been stretched as the lava flowed. Above the hammer head, the lava is massive and non-vesicular. Below the basalt is a red breccia unit, representing the weathered top of an older basalt flow.
Scale: Hammer handle is 40 cm long.
This page is maintained by Roger Suthren
Last Modified: 18 November, 2008