USGS - science for a changing world

Pacific Coastal & Marine Science Center

National Seafloor Mapping and Benthic Habitat Studies

Home - Introduction - Images - Products - Data - Applications - Publications - Contacts - Cooperators


Lake Michigan

Dahlia Shoal Perspective Views

Return to Dahlia Shoal Home Page

Click on the arrows within the index map below or the thumbnail images to view the perspective views.

Dahlia Shoal Index Map Dahlia Shoal perspective view 1

Larger View (164 kb)

Oblique view looking south over Ile Aux Gallet (A) with Dahlia Shoal (B) in the background. The rough relief of cobbles, boulders, and (or) outcrop occurs in water depths less than 15 m. Limestone outcrops were identified close to Ile Aux Gallet from underwater observations (Somers, 1968). Deep regions with smooth morphology (D) as well as deep pits (C) are covered with sand substrate. The vertical exaggeration is 4x and the distance across the bottom of the image is about 2.5 km.

Dahlia Shoal perspective view 2

Larger View (100 kb)

Oblique view of Dahlia Shoal (B) looking west. The ridge at (E), which is about 940 m long, is possibly a glacial depositional feature. Sand can be seen draping the rough relief (D) surrounding the shoal. The pit in the foreground drops in water depth from 10 to 26 m from F to F'. The vertical exaggeration is 4x and the distance across the bottom of the image is about 4.0 km.

 

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: http://walrus.wr.usgs.gov/pacmaps/persp.html
Page Contact Information: Peter Dartnell
Page Maintained By: Laura Zink Torresan
Page Last Modified: 8 September 2008 (lzt)