All Maps

As a successor to previous Colorado stratigraphy charts (MS-53 Colorado Stratigraphic Chart and MS-54 Cretaceous Stratigraphy of Colorado), this Colorado Geological Survey (CGS) publication resulted from a collaboration between the CGS, USGS, and the Denver Museum of Nature and Science (DMNS). The chart was designed to illustrate Cenozoic stratigraphy spanning the state’s many...

This reference map depicts the Kīlauea summit eruption within Halema‘uma‘u crater that began on December 23, 2024. As of this posting on April 30, 2025, the eruption has had eighteen episodes, with the most recent occurring on April 22.

This map shows deformation at Kīlauea volcano associated with the ongoing summit eruption that started on December 23, 2024.

Potentiometric-surface and depth-to-water maps for spring 2022 were created for the Mississippi River Valley alluvial aquifer (MRVA) using groundwater-altitude data from 1,136 wells completed in the MRVA and from the altitude of the top of the water surface in area rivers from 160 streamgages. The potentiometric-surface and depth-to-water maps for 2022 were created to support...

This thermal map was taken on the 7 a.m. overflight of Kīlauea summit on April 9, 2025, and shows the expansive lava flow covering the floor of Halema‘uma‘u, supplied by lava fountains at the vent.

This reference map depicts the Kīlauea summit eruption within Halema‘uma‘u crater that began on December 23, 2024.

This set of thermal maps shows activity near the beginning and just after the end of episode 16 lava fountaining at the summit of Kīlauea.

This close-up thermal map shows the crater floor at the summit of Kīlauea just an hour after the end of episode 16 lava fountaining on April 2.

This compilation shows thermal maps made shortly after three different lava fountaining episodes at the summit of Kīlauea.

This reference map depicts the ongoing Kīlauea summit eruption within Halema‘uma‘u crater as of March 18, 2025.

This reference map depicts the Kīlauea summit eruption within Halema‘uma‘u crater that began on December 23, 2024.

These thermal maps of the summit caldera at Kīlauea show the activity at two stages of episode 12.