Welcome     Mission     History     Location     Contact Us     Iowa DNR    
Geology and Water
Data Resources
CORE PHOTOGRAPH

Red ball iconMANSON IMPACT STRUCTURE CORE PHOTOGRAPH

Core  

Crystalline-Clast Breccia
with Melt-Matrix

M-1 core - 423 feet

The light clast is a graphic granite clast that recrystallized from impact melt to fine-grained quartz and sanidine (a similar clast yielded the 74 Ma impact age). The graphic nature of the clast was preserved. Gray clasts are gneiss and the matrix is dominated by melt-rock with abundant quartz and minor crystalline rock lithic clasts.

core is NX (1 7/8" diameter)

     
  return to Manson Impact Structure