Geologic Contacts

A geologic contact is the surface along which one rock touches another.  They may be either Depositional, Intrusive, of Fault contacts.


A depositional contact between sandstone (above) and conglomerate (below)

Intrusive contact between granite and gneiss.  Note irregularity of contact.

Fault contact (aerial) between different Mesozoic sedimentary rocks, Nevada.

Click here to see photo and interpretation of Rainbow Canyon

Return to Structure Syllabus

Go To Outcrop Patterns

Go to Slide Index