with Melt Matrix
M-1 Core--331 feet
Dark matrix is melt-rock; mottled grain
(right) is shocked, partially melted and recrystallized
quartz; sanidine grain recrystallized from melted
feldspar in the impact melt; similar grains yielded a 74
Ma age for the Manson impact.
field 3.2 x 2.1 mm