Within the map interface, zoom or click on a photograph thumbnail to expand clustered thumbnails and explore more than 1,000 photographs. The number listed alongside each thumbnail is the number of images within a cluster that can be expanded. Once all clustered thumbnails have been expanded, click on a thumbnail to view the full image and associated metadata. You can download the photograph directly using the download button or add the photograph to your cart to download later.
Several search tools are available to query photographs within the map. With the tools window expanded, use the "Search by keyword" input to return photographs whose metadata contain the keyword. You may also limit your search to a specific date range using the "Select date range" dropdowns and filter by a specific geologic type and region using the "Filter by region" and "Filter by geologic type" dropdowns.
The second tab within the tools window is the "Cart" tab. When exploring photographs within the map, if you expand a photograph thumbnail, you can choose to add photographs of interest to your cart by selecting the cart button. The cart allows you to manage and save photographs of interest. Items listed within the cart have the additional attributes "Geologic Quad," which links to the USGS quadrangle map within which the photograph is located, and "View on ScienceBase," which links to the USGS ScienceBase page for the individual photograph. Within the cart tab, you can download individual photographs by clicking the download button located under each photograph or remove photographs from the cart using the X button located next to the download button. You can also download all photographs in the cart using the "Download All" button or empty the cart with the "Empty Cart" button, each located at the top of the cart tab.
Use the checkboxes within the basemaps tab to toggle between basemaps. The choices are street map, satellite imagery, and elevation model. Add the "Geologic map layer" and zoom to a fine enough scale to view the underlying geology of the region, as mapped by George Billingsley and coauthors. This layer was derived from nine USGS 1:100,000-scale geologic maps, which are listed and linked below. Explore the geologic map units by clicking to reveal more information, including age and description; contacts between units are shown as a thin black line. Faults (thicker black lines) are also shown in this layer as either solid, dashed, or dotted lines that indicate accurate, inferred, and concealed locations, respectively, but are not explained further; many major and minor faults and other structures are discussed in detail in the source publications. Geologic map-unit labels use Federally approved geologic age symbols for the divisions of geologic time (see Federal Geographic Data Committee, 2006). However, ASCII characters1 are substituted for the following geologic periods: '-C' is substituted for the geologic age symbol for Cambrian, 'IP' for Pennsylvanian, and 'Tr' for Triassic. Geologic age is spelled out in parentheses after each geologic map-unit name. Note that geologic map units may not match across the edge of the published maps because they were mapped with differing levels of detail.
The Grand Canyon geologic field photograph collection contains 1,211 geotagged photographs collected during 43 years of geologic mapping from 1967 to 2010. The photographs document some key geologic features, structures, and rock unit relations that were used to compile nine geologic maps of the Grand Canyon region published at 1:100,000 scale, and many more maps published at 1:24,000 scale. Metadata for each photograph include description, date captured, keywords, coordinates, and a keyword system that places each photograph in one of the following categories: arches and windows, breccia pipes and collapse structures, faults and folds, igneous rocks, landslides and rockfalls, metamorphic rocks, sedimentary rocks, sinkholes, or springs and waterfalls. Where photographs fit into multiple categories, they are duplicated with different captions to explain the visible features. Photograph coordinates either represent the approximate location of the feature shown in the photograph or the point from which the photograph was taken (for landscape or aerial photographs).
Photographs and metadata are managed through the USGS ScienceBase data catalog. Visit the ScienceBase page for more information about the data and to download the entire field photograph collection.
To reference the map application, please use the suggested citation:
Billingsley, G.H., Goodwin, G., Nagorsen, S.E., Erdman, M.E., and Sherba, J.T., 2019, Geologic field photograph map of the Grand Canyon region, 1967–2010: U.S. Geological Survey General Information Product 189, https://doi.org/10.3133/gip189.
To reference the photograph collection, please use the suggested citation:
Billingsley, G.H., Goodwin, G., Nagorsen, S.E., Erdman, M.E., and Sherba, J.T., 2019, Geologic and related photographs of the Grand Canyon region (1967–2010): U.S. Geological Survey data release, accessed [Month Day, Year], at https://doi.org/10.5066/F7WS8SHW.