‘Flesh’ atop of the ‘bones’ of bedrock geology

The Surficial geology section is divided into:

● Alluvial landforms & processes

● Glacial history & landforms,

● Glacial rebound & coastal landforms, and

● Mass wasting.

surficial

Surficial versus bedrock geology. For more comprehensive discussion, see Reading Southeast Alaska’s landscape Carstensen & Connor (2013)

Explore those sub-categories or find general information below, scrolling through links under In this section. Note that there are relatively few, because surficial geology is a pretty broad topic. If, for example, a journal or report focused mostly on alluvial landforms, it’ll be listed instead with resources on that more focused category page.

You can also view the entire JuneauNature hierarchy at this site map.

Surficial geology is the study of loose, unconsolidated material overlying the bedrock foundation. These layers were deposited, rearranged and eroded by glaciers, fluctuating sea level, streams, landslides, and bulldozers. While bedrock geologists tend to think in time-frames of millions of years, the surficial story is usually faster paced, taking place over millennia and mere centuries.

While bedrock geologists tend to think in time-frames of millions of years, the surficial story is usually faster paced, taking place over millennia and mere centuries. On the surficial geology map, I’ve divided landforms into 5 age groups. In the pop-ups, these are listed in the ‘geol_age’ field:

  • triassic: applied only to a couple bare-bedrock roches moutonees near Mendenhall Glacier
  • early holocene: marine, glacial and alluvial formations dating back to shortly after the great ice age, ~10,000 years ago
  • neoglacial: dating to just the last few millennia
  • little ice age: mostly formed since peak of the last glacial advance in the mid-1700s
  • anthropocene: built or excavated features mostly since 1950.

In this section

Evening class-4: Jilḵáat debrief & roadtour prep

Wow! these cross-fingers worked! What an amazing trip! Even better than pure-blue skies, there were enough puffy clouds and mixed…

2022 | Richard Carstensen | Landforms class archives

Getting started: orientation on campus

Custom geopdfs for Áak’w On our first class, we loaded the navigational app Avenza to our phones, and tested out…

2022 | Richard Carstensen | pair of geopdfs

Teachers at Fish Creek, 2022

Four days at the delta and Eaglecrest From June 9 to 12, 2022, Discovery gave the 4th in our series…

2022 | Richard Carstensen | 46 page journal

Geopdfs Gold geology

High-resolution GeoPDF pair for field navigation in Dzantik’i Héeni (Gold Creek) watershed. In apps such as Avenza, on your phone…

2019 | Richard Carstensen | 2 geopdfs

1867-2017: 150 years of change

Background paper for 3 banners commissioned by the Juneau Douglas City Museum, showing changes to iconic landscapes of Áak’w Aaní…

2017 | Richard Carstensen | 41 Pages

Surficial geology, ArcGIS Online

View larger map To begin mapping surficial geology in 2015, I used landform types and color-scheme from R.D. Miller, USGS,…

2015: update 2022 | Richard Carstensen | Arc Online

Natural history of Juneau trails: A watershed approach

Guide to natural and cultural history of the CBJ, summarizing Discovery’s longterm study on contract with Parks & Recreation that…

2013 | Richard Carstensen | 72 pages