The Geologic Resource Inventory (GRI) is one of 12 natural resource inventory efforts within the National Park Service (NPS) Inventory and Monitoring Program. The Program is a cooperative effort between the NPS and Colorado State University. It strives to advance science based management of natural resources in the national parks and raise awareness about geology and the role that geologic features and processes play in the environment.
The GRI team, working closely with a variety of partners, provides each of the 270 natural area parks with a geologic scoping meeting, digital geologic map data, and a park-specific geologic report. These products are designed to enhance stewardship of park resources by providing valuable information about geologic formations, hazards, and links between geology, history, and other natural resources. The maps and reports are available on the GRI publications page.
Scoping Meetings and Summary
The GRI team conducts scoping meetings at parks to review available data on park geology and discuss geologic issues. In addition to GRI staff, meeting participants may include: park managers and staff; geologists from the U.S. Geological Survey, state surveys, academic and private sectors; and other interested parties. Together, they evaluate the extent and quality of existing geologic maps and park-specific geologic resource management issues. The GRI may provide funds for new mapping in parks that lack or have inadequate map coverage.
Following the meeting, a scoping summary is produced. The summary document details the main points of the meeting and lays out the geologic mapping plan. While early scoping summaries focused primarily on geologic map issues, more recent summaries also include outlines and discussions of geologic issues, features, and processes. The summaries also include a list of meeting participants.
Links to Scoping Summaries can be found on the GRI publications page.
Geologic Maps (GIS)
Digital geologic maps reproduce all aspects of traditional paper maps, including notes, legend, and cross sections. The GRI may use bedrock, surficial, and special purpose maps such as geomorphological or geologic hazard maps to create digital data and meet park needs. This product allows geologic information to be easily viewed or analyzed in conjunction with a wide range of other resource management information in park geographic information systems (GIS).
Geologic maps are digitized and/or converted to the GRI data model.
GIS data is produced in ESRI Geodatabase and Shapefile formats.
A helpfile (.hlp format) or PDF document accompanies each map and includes all aspects of the original source products, including the geologic units and their descriptions, geologic cross sections, the geologic report, references and all other pertinent images and information contained in the original publication.
Links to Geologic Map data can be found on the GRI publications page.
After the geologic map is completed, a geologic report is prepared. GRI reports contain five major sections:
Identification and description of key geologic resource management issues;
Discussion of geologic features and processes important to park ecosystems and management;
A map unit properties table that identifies characteristics of geologic map units;
A brief geologic history of the park area; and
An overview of the digital geologic map data.
Links to Geologic Reports can be found on the GRI publications page.
View current status of scoping meetings, geologic reports, and digital geologic map data. [site removed, contact us for status information]
Park Uses of Geologic Information
Sequoia and Kings Canyon National Parks - Document glacial response to climate change
Buffalo National River - Explore groundwater and karst interaction
Dinosaur National Monument - Identify threatened plant habitat
Coronado National Memorial - Locate threatened animal habitat
Yosemite National Park - Identify areas with rockfall potential
Last updated: February 20, 2019