The seaward reef off JANET is comprised of four principal zones:
(1)
The
Algal Ridge, which consists of a zone of buttresses and surge channels comparable in general form to those described for BRUCE.
The ridge as a whole is
dark brown with a few pink or light brown areas, but the darker parts of the
ridge are almost black.
Surge channels and pothole-like depressions are floore<
with sand and well-rounded coral pebbles and boulders.
60 feet wide.
{2)
The Coral Zone is a rough rock flat with a relief of one
foot or more and a width of about 140 feet.
near the ends
The ridge zone ig about
Living corals are very numerous
of the surge channels but over the zone as a whole they probably
do not cover more than 15% of the surface.
Near the landward edge of the zone
are scattered remnants of an older algal limestone that rises from six inches
to a foot above low tide level.
wide,
(3)
The Rock Flat, which is about 910 feet
is a barren surface with many pools in pits and irregular depressiona.
The surface is rough near its seaward edge becoming smoother lagoonward with
thin patches of sand.
(4)
The Beach Zone is covered with a fine ripple-marked
sand at the edge of the rock flat.
coarser with worn coral heads
At higher levels the covering becomes
commonly exceeding a foot in diameter.
The lagoon
beach at JANET is a broad gravel and sand beach sloping gently lagoonward and
extending out into relatively deep water.
KEITH, a minor islet of the atoll, is located on its southwestern edge
about 12 miles almost due west of FRED Islet and some 2-3 miles southeastward
from Southwest Passage.
KEITH is nearly teardrop shaped and measures about 0.3
miles long by 0.1 miles wide.
It is oriented approximately northwest by south-
east and consists of less than 0.1 square miles of dry land.
No large instal-
lations have been placed on this islet and as a result both its natural topography and vegetation have remained largely undisturbed.
A relatively narrow
ridge, lying along the central axis of the islet and reaching heights above 13
feet above sea level, is the most prominent feature on this islet.
The land
slopes gently both lagoonward and seaward from this narrow ridge (Figure 11).
As
one proceeds along the ridge in a southeasterly direction it terminates near
the center of the islet, where the land surface slopes steeply down to a nearly
flat table-like area located about 5 feet above sea level.
This table area
comprises the entire southeastern half of the islet.
The seaward reef along the southwestern edge of KEITH can be divided into
14