Field Trip 6: Mapping Precambrian Crystalline Rocks, Llano Uplift


I. Objectives

  • Make a geologic map of the Cambrian/Precambrian nonconformity on ranch property south of Streeter.
  • Write concise unit descriptions of each of the map units - Riley Fm., Hickory Sandstone and Calcite/Dolomite Marbles of the Packsaddle Schist.
  • Make a geologic map of folded Precambrian marbles.

II. When

  • April 28-29 (Drs. Helper & Marrett; this is an overnight trip - all sections go the same weekend)

We depart Saturday at 7:00 AM from the east basement door and will be back on campus by about 8:00 PM Sunday.

III. Bring

  • Two lunches
  • Camping gear (can be rented from UT RecSports)
    • sleeping bag
    • sleeping pad
    • + tent
  • Compass, GPS, hand lens, hammer
  • Clipboard, field book
  • Ink pens (2), colored pencils, eraser, protractor, mech. pencil, white out.

Breakfast and dinner will be provided.  Please email Dr. Helper if you are a vegetarian.

 

PC Llano Uplift, plutons in red
Precambrian granites (red) and host gneiss/ schist units (gray), Llano uplift.

IV. Background Material

Get map symbol key     Map symbols for this project

Department of Geological Sciences

Comments and questions to helper@mail.utexas.edu
Jackson School of Geosciences Last updated April 25, 2012