Sedimentology of the Sixteen Mile Creek Lagoon, Niagara Peninsula, Ontario, Canada

The effec s of relative water level changes in Lake Ontario were detected in the ysical, chemical and biological characteristics of the sediments of the Fifteen, Sixteen and Twenty Mile Creek lagoonal complexes. Regional environmental changes have occurred resulting in the following sequence of sediments in the three lagoons and marsh. From the base up they are; (I) Till,(2) Pink Clay, (3) Bottom Sand, (4) Gyttja, (5) Orange Sandy Silt, (6) Brown Clay and (7) Gray Clay. The till was only encountered in the marsh and channel; however, it is presumed to occur throughout the entire area. The presence of diatoms and sponge spicules, the vertical and ongitudinal uniformity of the sediment and the stratigr ic position of the Pink Clay indicate that it has a glacial or post-glacial lacustrine origin. Overl ng the Pink Clay or Till is a clayey, silty sand to gravel. The downstream fining and unsorted nature of this material indicate that it has a fluvial/deltaic origin. Water levels began rising in the lagoon 3,250 years ago resulting in the deposition of the Gyttja, a brown, organic-rich silty clay probably deposited in a shallow, stagnant environment as shown by the presence of pyrite in the organic material and relatively high proportions of benthic diatoms and grass pollen. Increase in the rate of deposition of the Gyttja on Twenty Mile Creek and a decrease in the same unit on Sixteen Mile Creek is possibly the result of a capture of the Sixteen Mile Creek by the Twenty Mile Creek. The rise in lake level responsible for the onset and transgression of this III unit may have been produced by isostatic rebound; however, the deposition also corresponds closely to a drop in the level of Lake Huron and increased flow through the lower lakes. The o ange Sandy Silt, present only in the marsh, appears to be a buried soil horizon as shown by oxidized roots, and may be the upland equivalant to the Gyttja. Additional deepening resulted in the deposition of Brown Clay, a unit which only occurs at the lakeward end of the three lagoons. The decrease in grass pollen and the relatively high proportion of pelagic diatoms are evidence for this. The deepening may be the result of isostatic rebound; however, the onset of its deposition at 1640 years B.P. is synchronous in the three lagoons and corresponds to the end of the subAtlantic climatic episode. The effects of the climatic change in southern Ontario is uncertain. Average deposition rates of the Brown Clay are similar to those in the upper Gyttja on Sixteen Mile Creek; however, Twenty Mile Creek shows lower rates of the Brown Clay than those in the upper Gyttja. The Gray Clay covers the present bottom of the three lagoons and also occurs in the marsh It is inter1aminated wi sand in the channels. Increases in the rates of deposi ion, high concentrations of Ca and Zn, an Ambrosia rise, and an increase in bioturbation possibly due to the activities of the carp, indicate th this unit is a recent deposit resulting from the activities of man.

Sketch of Charles Clarke Chapman

Photographic copy of a portrait sketch of Charles C. Chapman in the Chapman College president's office, Orange, California

Vern Ummel and Irvin C. (Ernie) Chapman at the Chapman College 124th Anniversary, 1985.

Vern Ummel and Irvin C. (Ernie) Chapman at the Chapman College 124th Anniversary, Orange, California, March 4, 1985.

President G. T. "Buck" Smith presents Irvin C. "Ernie" Chapman with 50th year diploma at Commencement, 1983

President G. T. "Buck" Smith presents Irvin C. "Ernie" Chapman with 50th year diploma at Commencement, Chapman College, Orange, California, May 29, 1983.

Gold Coast

Crate label for Gold Coast brand oranges picked and packaged by the Placentia Orange Company, which was owned and managed by Charles C. Chapman.

Golden Eagle

Crate label for Golden Eagle brand oranges picked and packaged by the Placentia Orange Company, which was owned and managed by Charles C. Chapman.

Old Mission Brand grapefruit

Crate label for Old Mission Brand grapefruit picked and packaged by the Placentia Orange Company, which was owned and managed by Charles C. Chapman.

Architectural rendering of the Argyros Forum

Photographic copy of the architectural rendering of the Argyros Forum, Chapman University, Orange, California. Architect: Bob Murrin. Groundbreaking September 16, 1991 and dedication October 26, 1992.

Argyros Forum, detail of door

Detail of a door, Argyros Forum, Chapman University, Orange, California, ca. 1992.

Argyros Forum

Looking up at architectural details of Argyros Forum, Chapman University, Orange, California, ca. 1992.

Argyros Forum

Looking southeast at the Argyros Forum, Chapman University, Orange, California, 1992.

Looking out from Argyros Forum window

Looking north from inside Argyros Forum towards the athletic field, Chapman University campus, Orange, California, ca. 1992.

Argyros Forum

View of the Argyros Forum from the athletic field, Chapman University, Orange, California, ca. 1992.

Argyros Forum

Exterior detail of the Argyros Forum, Chapman University, Orange, California, an 100,000 square-foot building providing office, dining and classroom space; a bookstore, art galleries and lounge facilities.

Argyros Forum

Exterior photograph of the Argyros Forum, Chapman University, Orange, California, showing plaza area and steps leading to entrance.