Introduction to Structural Geology (1-19-98)

Structural Geology is primarily
the study of mountain belts		 Undeformed strata of the Grand Canyon
Facing indicators--dune crossbeds Pillow basalts
Angular unconformity Folded strata in the Alps
Thrust fault in the Alps Thrust fault in the Catkills
Strike-slip fault in California Striations on fault surface
Satellite image of the Appalachians
Primary Structures (1-30-98)
Sedimentary layering Fossils can be useful facing, paleoenvironmental, and age indicators
Modern mud cracks Silurian mud cracks
Modern dune crossbeds Jurassic dune crossbeds in Zion NP
Graded beds--more facing indicators Sole marks--facing and current indicators
Pillow basalts can be useful facing indicators
Unconformities & Contacts (2-2-98)
Hutton's angular unconformity at Siccar Pt., Scotland The "Taconic unconformity," Catskill NY
Near-vertical angular unconformtiy, French Alps Non-conformity--Triassic dolostone over crystalline basement, French Alps
Tectonic contact: indicated by striations on surface Tectonic contact: slickensides
Tectonic contact: indicated by offset Tectonic contact: indicated by fault gouge
Joints & Fractures (2-9-98)
Exfoliation joints--Half Dome Tension gashes--left lateral movement