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Bedrock Geology Map

From Richard Carstensen:

Bedrock geology is a vast subject. Of greatest interest to naturalists are ways in which underlying rock types, alignments, fracture patterns, and variable resistance to erosion explain the shape of the land and the distribution of natural communities.

Here is a map of Bedrock geology. Units are based upon a detailed map-in-progress by USGS, but color coded by 6 broad rock-type families. Expand the legend (>>, upper left) to see them. Notice that granitic types (pink, our highest & most resistant peaks) are mostly back under the icefield. Rocks with highest carbonate content (blue) hosted most of Juneau’s successful mines. For more info on each rock unit, click, and a popup will name the geologic period (capital letters in the code), dominant rocks, and broader rock family

Herbert Glacier Trail

The Herbert and neighboring Eagle Glaciers advanced and receded synchronously with the much better known Mendenhall. They’ve always been strenuous hikes, but recession off their floodplains up into rugged hills makes them annually more challenging destinations. Fortunately for those of us with ever gimpier knees, you can now ride much of the way to Herbert Glacier on a bicycle.

Trail to Herbert Glacier, with dated recessional moraines from the work of Donald Lawrence. Yellow circles show successional stages where we collected fungi in 1984.

Trail to Herbert Glacier, with dated recessional moraines from the work of Donald Lawrence. Yellow circles show successional stages where we collected fungi in 1984.

Montana Creek Map Series

This document assembles aerial imagery and other GIS-based maps of Montana Creek for use by teachers in class and field.  It was originally assembled for use during the STREAM: Pedagogy of Place conference in 2013.

Download Here (6MB): PDF_Download


Our dynamic home: Southeast Alaska then and now

In this half-hour video of still photography, Richard Carstensen looks at a rich archive of historical aerial photos taken in 1948 for mapping purposes, and compares them to present day images of Southeast Alaska communities. The result illuminates not only how the natural areas have changed, but also how our communities have changed.

From Richard:

In 2011, Cathy Pohl and I [Richard Carstensen] received a drive with 22,000 scanned air photos taken by the Navy in 1948. For the first time, cartographers and researchers in Southeast Alaska could efficiently access this extraordinary collection, studying natural and anthropogenic change in photos spanning 60 years. To celebrate, I created this 35-minute narrated slideshow comparing the 30-or-so Southeast communities, then and now.

Surficial Geology Map

From Richard Carstensen:
Here’s a surficial geology map for the Juneau area. I used most of the geologic surface types of R.D. Miller, USGS, 1972, Some types were collapsed into broader categories: especially the many varieties of colluvial and raised-marine landforms. On the other hand, unit boundaries have been considerably adjusted and fine-tuned from 2013 DEM-generated bare-earth. Miller’s original map is available as a pdf from ADNR.
Zoom with your mouse roller. Click on any of the color coded units for a pop-up listing landform type, generating agent, and geologic age. For a legend, open >>, upper left. To view this map in ArcGISonline, select view larger map.


Bandana out the roadBandana out the road

Topo Map Bandana


What better way to figure out where you’re heading than to wear a map?   Choose from Downtown & Douglas or Valley & Out the Road.