General studies : November, 1967 / by John C. Ayers, Joseph C. K. Huang.

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of a brown mineral (probably hematite) to cause the observer to
note "speckled" in his reading of the sands.
One sample of coarse sand was taken of f Livingston Road, and
a couple just below the mouth of the St. Joseph River.
Medium sand was taken in a few samples along the beach south
of the mouth of the St. Joseph River. It was also taken in a somewhat larger area at the outer edge of the survey northwest of Grand
Marais Lakes. One sample was also taken off the north edge of the
plant property.
Soft grey loam (sand-silt-clay) was taken in a few samples
west of Grand Marais Lakes, and northwest and north of those
lakes. The sand of these loams was fine sand.
Except for the predominance of silty and non-silty fine sands,
there are only two items of ecological interest: the widespread
occurrence of organic material with a local area of abundance
southwest of the mouth of the St. Joseph River, and a definite
area of sandy silt surrounding the mouth of that river. Cook and
Powers (1964) studied the effect of the St. Joseph on the bottomliving organisms. At stations around the river mouth they found
these organisms to be dominantly pollution-tolerant forms, and
speculated that organic solids contributed by the river should
modify.the sediments near the river mouth. We find that modification to be present.
The Local Benthic Organisms
On 13 and 15 July 1966, we surveyed the local population of
bottom organisms. The survey consisted of collecting samples in
a regular fashion in lines perpendicular to the beach. The survey