PubTalk 11/2005 — Shifting Shoals and Shattered Rocks
Detailed Description
HOW MAN HAS CHANGED THE FLOOR OF SAN FRANCISCO BAY
by John Chin and Florence Wong, Geologists
- San Francisco Bay is one of the world's finest natural harbors and a major center of maritime trade
- All ships visiting bay ports are funneled through the central bay
- Bedrock knobs that rise from the central bay floor have been repeatedly blasted to accommodate vessels of increasingly deeper draft
- Sediment dredged from harbors and shipping channels has been disposed of on the bay floor
- Since the early 1900s, the bay floor has been mined for sand and gravel
- New tools are allowing scientists to create detailed views of the bay floor, revealing changes that man has made since the Gold Rush
Details
01:26:41
Sources/Usage
Public Domain.