Figure 2. ROV image of sediment surface of the deep, aphotic Isolated Sinkhole showing the brown and grey mats and a near-bottom nepheloid layer (Biddanda et al., 2006). Left Panel: ROV-video still images of conspicuous benthic grayish-white and brown mats, composition unknown; Right Panel: ROV image of sediments and exposed logs in Isolated Sinkhole (93 m).

Figure 2.  ROV image of sediment surface of the deep, aphotic Isolated Sinkhole showing the brown and grey mats and a near-bottom nepheloid layer (Biddanda et al., 2006).  Left Panel: ROV-video still images of conspicuous benthic grayish-white and brown mats, composition unknown; Right Panel: ROV image of sediments and exposed logs in Isolated Sinkhole (93 meters).  Also in the photo is a cloudy nepheloid layer about 1 meter above the lake bottom – presumably caused by venting groundwater at the site – as indicated by water chemistry. Image courtesy of Thunder Bay Sinkholes 2008.

 

Related Links

Thunder Bay Sinkholes 2008

Thunder Bay Sinkholes 2008: Sinkholes

NOAA Ocean Explorer Gallery