What This Document Is
This document is a student handout for Lab 3 in GEOL 120, Exploring Earth Physical Geology at Colorado State University. It focuses on rock identification and interpretation, specifically using rock samples from the Colorado Front Range, and introduces the use of geologic maps to understand regional geology. It’s designed to be used *during* a hands-on lab session.
Why This Document Matters
This handout is essential for students enrolled in GEOL 120 who need to develop practical skills in identifying rocks and relating them to their geological context. It’s used during a lab exercise where students analyze physical samples and interpret geological maps. Understanding the rocks around Fort Collins and the foothills is a key outcome of this lab.
Common Limitations or Challenges
This handout provides a framework for rock analysis and map reading, but it does not *teach* the underlying geological principles. Students are expected to have foundational knowledge of rock types and geological processes from lectures and prior coursework. The provided sample descriptions are incomplete – the full lab requires students to fill in their own detailed observations and interpretations.
What This Document Provides
This handout includes:
* Learning objectives for the lab.
* A structured format for describing and identifying unknown rock samples, including sections for detailed descriptions, rock type classification (igneous, sedimentary, or metamorphic), identification, and formation hypotheses.
* Partial sample data to illustrate the expected level of detail.
* A section on geologic maps, including questions to guide map interpretation (what the map shows, spatial area, color representation, location of rock types).
* Examples of how to extract information from a geologic map, including rock name, age, and composition for specific formations (Xbc, Xqs, PPf).
It does *not* include complete answers to the lab questions, detailed explanations of geological processes, or a comprehensive key for rock identification.
