The sedimentology of the Bloomington fan complex: an element of the Oak Ridges Moraine, Southern Ontario

The Oak Ridges Moraine is a major physiographic feature of south-central Ontario, extending from Rice Lake westward to the Niagara Escarpment. While much previous work has largely postulated a relatively simple the origin of the moraine, recent investigations have concentrated on delineating the discernible glacigenic deposits (or landform architectural elements) which comprise the complex mosaic of the Oak Ridges Moraine. This study investigates the sedimentology of the Bloomington fan complex, one of the oldest elements of the Oak Ridges Moraine. The main sediment body of the Bloomington fan complex was deposited during early stages of the formation of the Oak Ridges Moraine, when the ice subdivided, and formed a confined, interlobate lake basin between the northern and southern lobes. Deposition from several conduits produced a fan complex characterized by multiple, laterally overlapping, fan bodies. It appears that the fans were active sequentially in an eastward direction, until the formation of the Bloomington fan complex was dominated by the largest fan fed by a conduit near the northeastern margin of the deposit. Following deposition of the fan complex, the northern and southern ice margins continued to retreat, opening drainage outlets to the west and causing water levels to drop in the lake basin. Glaciofluvial sediment was deposited at this time, cutting into the underlying fan complex. Re-advancing northern ice then closed westerly outlets, and caused water levels to increase, initiating the re-advance of the southern ice. As the southern ice approached the Bloomington fan, it deposited an ice-marginal sediment complex consisting of glacigenic sediment gravity flows, and glaciolacustrine and glaciofluvial sediments exhibiting north and northwesterly paleocurrents. Continued advance of the southern ice, overriding the fan complex, ii produced large-scale glaciotectonic deformation structures, and deposited the Halton Till. The subaqueous fan depositional model that is postulated for the Bloomington fan complex differs from published models due to the complex facies associations produced by the multiple conduit sources of sediment feeding the fans. The fluctuating northern and southern ice margins, which moved across the study area in opposite directions, controlled the water level in the interlobate basin and caused major changes in depositional environments. The influence of these two lobes also caused deposition from two distinct source directions. Finally, erosion, deposition, and deformation of the deposit with the readvance of the southern ice contributed further to the complexity of the Bloomington fan complex.

Charles C. Chapman and Ethel Chapman Wickett at a birthday picnic for Charles C. Chapman at Orange County Park, California, July 2, 1937

Charles C. Chapman and Ethel Chapman Wickett at a birthday picnic for Charles C. Chapman at Orange County Park, California, July 2, 1937. [Copy an excerpt of CCCF27]

Charles C. Chapman, Ethel Chapman Wickett and Stanley Chapman at Orange County Park, 1937

Charles C. Chapman, Ethel Chapman Wickett and Stanley Chapman at birthday picnic for Charles C. Chapman at Orange County Park, California, July 2, 1937.

Annual report of the Commissioners for the Queen Victoria Niagara Falls Park of the Province of Ontario, 1887.

Description based on: 16th ed. (1901).

Annual report of the Commissioners for the Queen Victoria Niagara Falls Park of the Province of Ontario, 1888.

Description based on: 16th ed. (1901).

Annual report of the Commissioners for the Queen Victoria Niagara Falls Park of the Province of Ontario, 1889.

Description based on: 16th ed. (1901).

Annual report of the Commissioners for the Queen Victoria Niagara Falls Park of the Province of Ontario.

Description based on: 16th ed. (1901).

Annual report of the Commissioners for the Queen Victoria Niagara Falls Park of the Province of Ontario, 1892.

Description based on: 16th ed. (1901).

Annual report of the Commissioners for the Queen Victoria Niagara Falls Park of the Province of Ontario, 1893.

Description based on: 16th ed. (1901).

Annual report of the Commissioners for the Queen Victoria Niagara Falls Park of the Province of Ontario, 1894.

Description based on: 16th ed. (1901).

Central Park, Sterling, Illinois

Written on front: "Central Park, Sterling, Illinois, 24729." Written on back: "My playground 1911-13 and 1916-19."

Chapman Park Hotel, Wilshire Boulevard, Los Angeles, 1934.

Chapman Park Hotel, Wilshire Boulevard between Mariposa and Alexandria Avenue, Los Angeles, 1934. Formerly named the Alexandria Hotel, it was built in 1906 and enlarged in 1909. The Santa Ysabel Land Company, controlled by Charles C. Chapman and his son, Stanley Chapman, purchased the hotel in 1930. It housed the United States women for the 1932 Olympics in Los Angeles.

Chapman Park Hotel, Wilshire Boulevard, Los Angeles, 1934

Chapman Park Hotel, Wilshire Boulevard between Mariposa and Alexandria Avenue, Los Angeles, 1934. Formerly named the Alexandria Hotel, it was built in 1906 and enlarged in 1909. The Santa Ysabel Land Company, controlled by Charles C. Chapman and his son, Stanley Chapman, purchased the hotel in 1930. It housed the United States women for the 1932 Olympics in Los Angeles.

Garden of the Chapman Park Hotel, Wilshire Boulevard, Los Angeles, 1935

Garden of the Chapman Park Hotel, Wilshire Boulevard between Mariposa and Alexandria Avenues, Los Angeles, 1935. Formerly named the Alexandria Hotel, it was built in 1906 and enlarged in 1909. The Santa Ysabel Land Company, controlled by Charles C. Chapman and his son, Stanley Chapman, purchased the hotel in 1930. It housed the United States women for the 1932 Olympics in Los Angeles.