The USGS previously mapped the bedrock and Tertiary and Quaternary volcanic stratigraphy in the Flagstaff area. With STATEMAP support, AZGS geologists Ann Youberg and Jeri Young-Ben Horin are investigating the alluvium and geohazards – flooding, debris flows and earthquakes. The LiDAR images below, one displaying bedrock geology, and the second with geographic annotation are informing the mapping. AZGS' focus is on the light gray areas adjacent to the volcanics. These data will require revisioning of some of the bedrock contacts, and the same topo data with 10m contours. USGS's Kyle House is assisting with building out slope maps to better image the topography. The lidar data is a game changer. (A. Youberg & JY. Ben Horin)

Joint 70th Rocky Mountain Annual Section / 114th Cordilleran Annual Section Meeting - 2018

Charles Ferguson is leveraging STATEMAP-supported geologic mapping of the Santa Catalina-Rincon core complex and the Oatman area for a presentation and field trip guide at the upcoming GSA meeting in Flagstaff, Arizona. Select the live links for the abstracts.

Ferguson, C.A., 2018, Evidence for Northwesterly Extension in the Tucson Basin, Arizona, USA, from Pseudotachylite Breccia Along the Main Detachment Fault of the Santa-Catalina-Rincon Mountains Core Complex

Howard, K. and Ferguson, C.A., 2018, Colorado River Extensional Corridor: New Perspectives From Detached Rocks in the Sacramento Mountains

Ferguson, C.A., 2018, Field trip to Silver Creek Caldera and Peach Spring Tuff Field, Sun.–Mon., 13–14 May, 7:30 a.m. departure; 4:30 p.m. return. You can download Charles' Silver Creek Caldera field guide here: http://repository.azgs.az.gov/uri_gin/azgs/dlio/1878

US Bureau of Mines’ reports specific to Arizona are being stockpiled at the AZGS Online Document Repository for ease of access for our Arizona stakeholders. This includes USBM’s Information Circulars (I.C., 32 reports ), Report of Investigation (R.I., 8 reports) and Mineral Land Assessment (MLA, 84 reports) reports.
 

AZGS' Brad Johnson joined San Diego State University Geology Alumni in the northern Dome Rock Mountains, Arizona, and the southern Big Maria Mountains, California. The two ranges contain Proterozoic basement rocks and highly deformed metamorphic correlatives of Grand Canyon Paleozoic sedimentary rocks. The effects of heterogeneous distributed shear on these rocks is most impressive.

IMAGE. View to the east of part of a north-dipping, overturned, highly attenuated fold limb in the Big Maria Mountains. The person on the left is standing on the unconformity between Proterozoic granitoid rocks (to viewer's left) and the Cambrian Tapeats quartzite. Between there and the other person is the entire Cambrian section consisting of Tapeats, Bright Angel schist, and Muav marble.
The person on the right is standing on Devonian dolomitic marble. The resistant brown ledge in the lower right corner of the photo, and continuing in the distance behind that person, is the Pennsylvanian-Permian Supai Group. The Mississippian Redwall marble forms a 1-meter-thick white ledge just above the Supai. Photo by George Morgan.

While not a STATEMAP product, we just released (2/27/18) a vintage report by William Chenoweth on uranium-vanadium mineral production in northeastern-most Arizona. Title of the 24-page report, ' The Geology and Production History of the Uranium- Vanadium Mines on Plot 6, West Reservation Lease, and on Hoslie Henry’s Mining Permits, Northwestern Carrizo Mountains, Apache County, Arizona.  You can view and download the report at http://repository.azgs.az.gov/uri_gin/azgs/dlio/1746 .

In late December 2017, AZGS released four digital geologic map products stemming from 2017 USGS STATEMAP funding. The maps are available as high-quality .pdf images at the online AZGS Document Repository (http://repository.azgs.az.gov).

• Ferguson, C.A., Pearthree, P.A., Johnson, B.J., Guynn, J. and McCosby, J.B., 2017, Geologic map of the Oatman 7 ½' Quadrangle, Mohave County, Arizona. Arizona Geological Survey Digital Geologic Map 119 (DGM-119), 1 map sheet, 1:24,000.
• Youberg, A.M. and Cook, J.P., 2017, Geologic map of the Pima and southern half of the Markham Creek 7 ½' Quadrangles, Graham County, Arizona. Arizona Geological Survey Digital Geologic Map (DGM-120), 1 map sheet, 1:24,000.
• Johnson, B.J., Gootee, B.F., Pearthree, P.A. and Ferguson, C.A., 2017, Geologic map of the Middle Camp Mountain 7 ½' Quadrangle, La Paz, Arizona. Arizona Geological Survey Digital Geologic Map (DGM-121), 1 map sheet, 1:24,000.
• Gootee, B.F., Pearthree, P.A. and Johnson, B.J., 2017, Geologic map of the Moon Mountain SE and western edge of the Bouse SW 7 ½' Quadrangles, La Paz County, Arizona. Arizona Geological Survey Digital Geologic Map (DGM-122), 1 map sheet, 1:24,000.