Prerequisites: GEOL 310/L and GEOL 341/L. A two-course sequence on advanced observation and collection of geologic field data and the construction of geologic maps, cross-sections and stratigraphic sections. Students must enroll in both A and B courses during the same summer session, and fieldwork for both courses is completed during the first four weeks of the session. During the remaining weeks of the session, students must complete two comprehensive formal geologic field reports, including geologic maps and cross-sections, one for GEOL 430A and one for GEOL 430B. Available for graduate credit. Course fee required.