Relief and depth shown by shading and gradient tints.
Title from HTML index page (viewed on May 22, 2007).
Mode of access: Internet from the USGS web site. Address as of 11/6/07: http://pubs.usgs.gov/of/2007/1051/pdf/OF07-1051%5F508.pdf; current access via PURL.
System requirements: PC with Internet access and Adobe Acrobat Reader or similar software to handle .pdf (Portable Document Format) files.