Sanctuary
Quiz
Correct!
The
topography of the Sanctuary is deceptive. Stellwagen Bank is
the most prominent feature, but Tillies Bank and Jeffreys Ledge
to the north of it also offer some additional shallow areas.
Tucked between Stellwagen Bank and Jeffreys Ledge, in an area
called Tillies Basin, are several deeper areas reaching down
600 feet (200 meters) below the surface. Difficulties in getting
fishing gear into some of these areas has allowed a large numbers
of invertebrate species to take hold and flourish in the depths.
Stellwagen
Bank is the highest feature in the Sanctuary, although none
of it pierces the water's surface. The most shallow part of
the Bank is its southwest corner which has a depth of just 65
feet. The top of the Bank in this area is composed primarily
of coarse to fine sand. Because of heavy fishing pressure, there
is little three-dimensional growth of invertebrate species here.
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