Studies on water movements and sediments in Southern Lake Michigan : part 1[-3] ... / by John C. Ayers.

METHODS

The 524 samples upon which this report is based are indicated
in Figure 1.
The samples were for the most part in lines roughly perpendicul-ar to shore, the lines being from five to 15 miles apart.
In each line the sampling intervals usually were: at one-mile
intervals from the 1st through the 10th mile from the beach, at
2-mile intervals from the 10th through the 20th mile, and at 5 -mile intervals thereafter. In the center of the basin 23 samples
were taken in four lines down the slope toward the deepest portion.
A single sample was taken off, and between, the lakeward ends of
lines IV and V. Figure 1 shows that coverage of the basin is not
complete,-and that an additional line is needed between-lines
XXVIII and XXIX.
The sample numbers, distances from shore, depths of water,
and field descriptions of the sediments are given in the Appendix.
Sample numbers are consecutive by time of taking. Some lines
were taken on courses toward shore, others on courses away from
shore.
With the exception of about eighteen samples, all samples
were taken with the dwarf orange-peel sampler. Fifteen of the
samples were cores and two or three were obtained with the SmithMcIntyre sampler (a spring-loaded modification of the Petersen
dredge).
Navigation was by radar range and bearing out to about the
20th mile, beyond which navigation was by dead-reckoning.
The bathymetry shown in Figure 1 was provided by Prof. Hough

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