The town of Dimmick embraces Township 34, Range 1. The Little Vermillion passes from north to south through it, east of the centre, and the Tomahawk, its principal branch, comes from the northeast and joins it on Section 34. There is considerable light bluff timber along these streams, but little bottom of heavy timber growth like that of Troy Grove. The early settlements were correspondingly slow. Along the Tomahawk the St. Peters sandstone comes to the surface of the creek bottom, and the Trenton limestone shows slightly in the western part. The Illinois Central Railroad runs north near the centre of the town, and like all railroad towns, Dimmick has become populous and wealthy.
[Source: History of LaSalle County, Illinois by Elmer Baldwin, Chicago, Rand, McNally & Co., Printers, 1877, SKETCH OF THE PIONEER SETTLERS OF EACH TOWN IN THE COUNTY, Waltham, Page 466 - Transcribed by Nancy Piper]