|Field Trip Chairs|
|Trips During the Meeting|
During the Meeting
- 415. Geology of the Dinosaur Ridge, Red Rocks, and Fossil Trace Areas (FAMILY Trip)
Mon., 1 Nov., US$94 (L, R)
Cosponsor: GSA Sedimentary Geology Division.
Leaders: Tim Connors, Geologic Resources Division, National Park Service, ; Norm Cygan, Harald Drewes, Chris Carroll.
This trip will also run after the meeting (trip 419) but is not specifically designated for families.
- We will travel 20 miles west on 6th Avenue to Golden, Colorado, where we will hike along the Golden Fault to see Laramide-uplifted late Paleozoic to early Cenozoic rocks exposed near the Colorado School of Mines campus. We’ll also view the dinosaur footprints and fossil impressions of the Denver, Arapahoe, and Laramie Formations, along with trace fossil assemblages in the Fox Hills Sandstone. At the Triceratops Trail, we’ll take a short hike to view the hadrosaur pit as well as a controversial T-rex footprint impression. Next, we’ll head to North Table Mountain in Golden to see and discuss two-stage volcanism associated with the Laramide Orogeny. Time permitting, we will venture to South Table Mountain to view the Cretaceous-Tertiary boundary. Lunch will be at the Visitor’s Center for the Friends of Dinosaur Ridge near Morrison. After lunch, we’ll head up to Dinosaur Ridge to view Mesozoic dinosaur tracks and bones of the Dakota Sandstone and Morrison Formation and then head down-section to the nearby Red Rocks Amphitheater and Park to view the 1.4-billion-year hiatus contact between the Precambrian and the Penn-Perm Fountain Formation. Our final destination is Turkey Creek Canyon south of Morrison, where we will observe economic deposits, past and present, including a uranium roll front, oil seeps, and operating gravel quarries near Morrison. We’ll head back to Denver via C-470 and 6th Ave., arriving in Denver by 5 p.m.
- 416. U.S. Geological Survey
Tues., 2 Nov. US$50.
Cosponsor: U.S. Geological Survey Central Region
Leader: Ken Gerson, USGS, .
- Tour the USGS facility at the Denver Federal Center. See over 50 million maps, books, open files, and other publications. Visit the Rock Core Research Center with over 1.4 million linear feet of rock core preserved for use by scientists and educators from government, industry and academia. Also tour the National Ice Core Laboratory, a facility for storing, curating, and studying cores of ice taken worldwide from polar and other glaciers.
- 417. Kirk Bryan Field Trip: Historical Range of Variability in the Colorado Rockies
Wed., 3 Nov., US$95 (L, R).
Cosponsor: GSA Quaternary Geology and Geomorphology Division.
Leaders: Ellen Wohl, Colorado State University, ; Sara L. Rathburn.
- The concept of historical range of variability (HRV) has been used to characterize the natural or background variability in geomorphic systems in the absence of intensive human impacts. The relevance of this approach has recently been called into question, given the extent and intensity of human impacts to landscapes and the difficulty of returning to natural or reference conditions, as well as the existence of climate change. During this field trip, we will visit and discuss sites in Rocky Mountain National Park where resource managers are using HRV to restore geomorphic processes and forms altered during the past two centuries. We will visit Beaver Meadows, where the National Park Service is trying to reestablish beaver populations, and the Lawn Lake alluvial fan, where a dam failure flood in 1982 altered valley-bottom processes and forms. We will also discuss research being conducted in other portions of the park (the Upper Colorado River valley following the 2003 failure of a portion of the Grand Ditch, and the upper North St. Vrain Creek drainage south of Long’s Peak as a result of tree die-off from pine beetles) in connection with HRV and restoration. Our intent is to facilitate discussions concerning (1) when the concepts of HRV and reference conditions are useful; (2) the limitations on this usefulness; and (3) how geomorphologists and Quaternary geologists can contribute to restoration efforts based on their knowledge of HRV.
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