Eagle Lake Research Articles

Late Pleistocene and Recent History of Portion of Colorado River Valley of Texas: ABSTRACT

The modern valley of the Colorado River near Columbus and Eagle Lake is incised into terraces representing depositional surfaces of early Pleistocene sediments. The terraces which normally are cut landward from the deltaic shoreline areas have been accentuated by continued Pleistocene uplift along a down-to-the-basin fault crossing the river near Eagle Lake. Extensive deposition of coarse materials in the sag downstream from the fault has steepened stream and terrace gradients in comparison with gradients above the fault. The present river is progressively moving coarse materials downstream from earlier deposits. End_of_Article - Last_Page 1753------------

Dodsland Field, Saskatchewan: ABSTRACT

The Dodsland field is situated in southwestern Saskatchewan End_Page 954------------------------------ about 50 miles east of the Saskatchewan-Alberta boundary and 200 miles north of the International Boundary. The presence of a productive and possibly persistent oil column along the southern part of the Dodsland field was not known until August, 1958, when three pools, known as Gleneath, Eagle Lake, and Braeburn, six miles apart were discovered. Previously the field was known only for its potential of gas reserves. Development of the oil pools is still in the early stages, and it is not yet known whether or not they will join. To date, thirty-five wells have been drilled with an unusually high ratio of successes to failures. The field has the structure of an irregular dome on which there are several local highs. Gas has accumulated in the higher parts of the structure. Principal oil occurrences are on the southern flanks which are the center of present activity. The productive zone of the field is a fine-grained, argillaceous, marine sandstone belonging to the Viking formation of Lower Cretaceous age. The sandstone becomes more and more argillaceous towards the northern and eastern parts of the Dodsland structure, and within the map-area grades into shale on the northern flank. The porosity of the sand averages about 23 per cent and the permeability about 15 millidarcys. Gross oil sand thicknesses encountered in wells drilled to date range from 24 to 39 feet. Well completion procedure usually includes sand fracturing the Viking before placing the well on production. Completion costs are low due to the relatively shallow drilling depth of 2,250 feet. Wells are drilled in all three pools on an approved 80-acre spacing pattern. End_of_Article - Last_Page 955------------

An Occurrence of Tinstone in the Pre-Cambrian of Western Ontario

At Eagle Lake in western Ontario are early pre-Cambrian metamorphic rocks intruded by two different granites. The earlier, a gray granite, has dikes of light-colored pegmatite, which in one locality take the form of a tinstone-bearing pegmatitic greisen. A tinstone-bearing greisen has also been reported from eastern Manitoba, and a reddish pegmatite at Shatford Lake in eastern Manitoba also carries tinstone. The several occurrences indicate a tin-bearing area of about 150 miles in length.

Food Habits of Iowa Skunks in the Fall of 1936

An investigation of the food habits of the striped skunk (Mephitis mesomelas avia (Bangs)) and spotted skunk (Spilogale interrupta (Rafinesque)) in Iowa was undertaken by the writer during the fall of 1936 as a part of the studies in the ecology and management of these animals. Between September 15 and December 1 a collection of scats was made chiefly in the vicinity of Ames in Story County, but eight were collected from the vicinity of Eagle Lake and 21 from Garner, both in Hancock County, and 60 at Dewey's Pasture, Clay County, an ungrazed state preserve reverting to prairie, near Ruthven, Iowa. The scats, 210 in number, were found principally near skunk dens and in pathways along fence rows. The number of spotted skunk scats collected was, six in September, 13 in October, and 40 in November; and of the striped skunk, two in September, 31 in October, and 118 in November. The research was under the supervision of Dr. George O. Hendrickson, Assistant Professor in Wildlife Management, Iowa State College, and Dr. Logan J. Bennett, Associate Biologist, U. S. Bureau of Biological Survey. When the analyses were begun the weight method was used, but it was soon abandoned for the quicker, and more satisfactory volumetric system. Hence the frequency indices (Table 1) include records from scats analyzed under both methods, whereas the volumetric indices include only those studied by the volumetric process. Volume analyses were carried on by means of two cylinders, one graduated in cubic centimeters up to 100, and the other in fifths of a cubic centimeter up to 10. To increase accuracy, readings were made of the volume of the various foods under pressure of a glass plunger weighing 177 grams. In determining the numbers of insects in a scat, counts of the parts highly resistant to digestion were most helpful. The presence of crickets (Gryllus spp.), white grubs (Phyllophaga spp.), and ground beetles (Carabidae) was indicated by the mandibles. The hind legs were the best proof of grasshopper (Melanoplus spp.) occurrence, and the head capsules were practically all that remained of various larvae (Coleoptera, Lepidoptera, and Diptera). In comparing the proportions of different foods determined by scat analyses it should be remembered that the ratio between the quantities of these remains is not the same as that between the bulks of the original substances before consumption. The analyses are supplemented by the numbers of individuals eaten, however, and these help to make the method indicative and accurate enough for all practical pur-

Conglomerate of Abram Lake, Ontario, and its extensions

INTRODUCTION Conglomerates and associated clastic rocks occur in western Ontario at intervals from Eagle Lake to Lake Savant, roughly 150 miles from southwest to northeast. The study of these sediments was begun in the summer of 1928 and continued in 1929 and 1932. In the vicinity of Sioux Lookout and Minnitaki Lake a detailed study of these rocks was made. The geologic map (Pl. 51, facing p. 504) covers the area investigated. The writer was ably assisted in the field at various times by H. N. Johnson, of Halliday, North Dakota; W. M. Chappell, of the University of Washington, Seattle; C. E. Dutton, of the University of Minnesota; and D. L. Baker of New Haven, Connecticut. He is indebted to Dr. F. F. Grout, of the University of Minnesota, for many suggestions and criticisms, and to Oberlin College for a grant that partially defrayed the expense of the field work.

The Eagle Lake earthquake of July 21, 1921

The Eagle Lake earthquake of July 21, 1921

Nesting of the American Osprey at Eagle Lake, California

Nesting of the American Osprey at Eagle Lake, California

A Collecting Trip by Wagon to Eagle Lake, Sierra Nevada Mountains

ON the morning of June 5, 1905, in company with Jim and Stanley Taylor, both enthusiasts in bird-study, I started from Marin County equipped for a three months trip by wagon to Eagle Lake, California. We purposed to collect some of the birds of the Lake and intervening region, and at the same time to enjoy the wilderness that abounds in the northern counties of California. We had a trip of four hundred miles before us, a trip which proved to be one of the roughest we had ever experienced. A tedious fourteen hours of navigation up the Sacramento River brought us to the capitol city at 4 A. M. We were soon beyond the outskirts of Sacramento and into the big wheat fields of the valley, where after not more than three miles of travel we took our first specimen, a young Yellow-billed Magpie. Having secured a permit from the Fish Commissioners we were not so wary of being molested by the don't shoot here property owners, that were numerous enough along the county roads of the valley. From the second day on we began to take notes, and the long evenings were spent in putting up skins of birds we had anticipated putting in our cabinets. On the fourth day, after traveling thru the intense heat of the valley, we arrived at a beautiful spot at the base of the table mountains, the commencement of the Sierras. Here bird-life was at its height. It seemed like entering a large aviary as we walked thru the thick foliage that grew on either side of the creek. Tree Swallows, Kingbirds, Chats, Gnatcatchers, Woodpeckers, Vireos and others were all nesting in numbers; most nests found either contained young, or eggs advanced in incubation. The thickets of blackberry vines and thistles seemed to be there but for the purpose of a building-site for the Russet-backed Thrush and the Chat. The latter's pleasing whistle was ever to be heard, and above the din, from the throats of the numerous other birds, we would intently listen, at long intervals, to the melodious notes of the California Cuckoo.