54th Highway Geology Symposium
68th Field Conference of Pennsylvania Geologists
I was sent to work near Denver, Colorado in July and August of 2003 for three weeks, and on the weekends my coworker Neil and I drove around to look at rocks.
The first four photos are from Dinosaur Ridge, which is held up by the Dakota Formation and the famous Morrison Formation. The first shows the enormous I-70 roadcut through both formations, with the Dakota on the left and the underlying Morrison on the right (I think the boundary is gradational). The second shows another roadcut of the Dakota to the south of I-70, along the West Alameda Parkway where it crosses the crest of Dinosaur Ridge (GPS 39.67571307,-105.19276993). The third photo shows some ripple marks in the Dakota. The fourth shows what is probably a dinosaur (sauropod?) footprint in cross section.
The fifth photo shows a section of the Permian Fountain Formation. It happens to be taken at Garden of the Gods state park (Here is a good geologic map of the park). The Fountain Fm. is lithified alluvial fan deposits. The next photo shows the unconformity separating the Fountain Fm. (left) from the underlying precambrian gneiss, in the parking lot of Redrocks Amphitheater.
By the way, Redrocks must be one of the best places to see a show on earth. While I was there, Willie Nelson happened to be doing a show, so that is who I saw there. I'm no huge Willie Nelson fan and would not have gone out of my way to see him, but it was great. You can see Denver behind the stage as you watch, and there were thunderstorms over it while he played. We may have gotten a brief shower. The walls of the amphitheater are formed of the steeply dipping, colorful beds of the Fountain Formation, and the acoustics are great.
The last two images are panoramas taken from the summit of Mount Elbert, near Leadville, which is the highest point in the Rocky Mountains. I hiked up there with my coworker Neil. It was exhausting because I had never been above 14,000 feet before, but we made it and only nearly got struck by lightning. We were the last people up there for the day.
These are photos from The 54th Highway Geology Symposium, which was held September 24-26, 2003, in Burlington, Vermont. These are photos from the field trip held on Sept. 25, which consisted of several stops across the entire state.
The first, from Stop 1, shows a large xenolith of sandstone (probably from the Albee Fm.) within the Fairlee Pluton at mile marker 92.5 along I-91. The second shows a close-up of the contact between the xenolith and the pluton.
The third photo, from Stop 3, shows an overview of the E.L. Smith Quarry, owned and operated by the Rock of Ages Corporation in Barre, Vermont. They are quarrying the nearly homogeneous and unjointed Barre Granite. The fourth photo shows a roof pendant (or possibly a large xenolith?) of schist within the Barre Granite, which is probably the Waites River Formation, according to Dr. David Westerman of Norwich University.
||These are photos from the 68th Annual Field Conference of Pennsylvania Geologists, which was entitled Geology on the Edge: Selected Geology of Bedford, Blair, Cambria, and Somerset Counties. It was held on October 3 to 4, 2003. All the photos are from the first day of the main field trip, which was all about the Devonian Keyser Limestone.
The first four photos are from the Old Eldorado Quarry, at Mile Marker 30 along I-99/US220 in Blair County, south of the Plank Road Exit on the east side of the road. The first three show pictures of the abundant stromatoporoids (sponge-like animals) that are preserved there. The next shows a fragment of one of the beds that is made up almost entirely of crionod fragments.
The next two pictures are from the Alleghany Furnace Quarry within the town of Altoona. The first shows a minor unconformity within the Keyser formation (the color change below the field notebook). The second shows a thromboloid, which is an algal-like structure, that has caused the overlying bedding to thin at its edges, indicating that this is a primary structure, or one that was present during deposition. Compare this with a photo of a dionsaur footprint deforming the underlying beds in the Morrison Formation in Colorado.
The last two photos are some corals in the New Enterprise New Paris Quarry on Chestnut Ridge in Bedford County, PA - the last stop on the fieldtrip.