In 1828, Allan Cunningham embarked on a significant exploration of the Moreton Bay region, contributing substantially to the understanding of its geography and botany. Accompanied by Patrick Logan, the Commandant of the Moreton Bay Penal Settlement, and James Butler, Cunningham navigated the Brisbane River with meticulous attention to its natural features. They documented their journey from 26th July to 2nd August, noting the river’s fresh water, which was largely unaffected by tidal saltwater. Cunningham’s keen observations included the identification of various plant species such as Hibiscus heterophyllus and aquatic plants like Potamogeton natans, which thrived in the river’s relatively stable conditions.
The expedition faced numerous challenges as they progressed, including navigating through narrow channels and over gravel banks and rapids. Despite these difficulties, Cunningham diligently collected botanical specimens, expanding the scientific knowledge of the region’s flora. Notable discoveries included Kennedia rubicunda and several species of Acacia. The terrain they traversed varied from dense brushwood to open forest land, with significant stands of Eucalyptine timber indicating fertile soil. The detailed documentation of these botanical finds was crucial for understanding the biodiversity of the Moreton Bay area.
Towards the end of their exploration, Cunningham, Logan, and Butler ascended various high points to survey the surrounding landscape. Their observations led to the conclusion that the Brisbane River likely had a distant western origin rather than rising from nearby mountains. This insight was based on the gradual decline of the lateral western ranges of Mount Warning. The comprehensive bearings and botanical specimens collected during this expedition significantly enhanced the scientific community’s understanding of Moreton Bay’s natural environment, marking a pivotal contribution by Cunningham to Australian exploration.
Referencing
John Gladstone Steele (1983). The Explorers of the Moreton Bay District, 1770-1830. University of Queensland Press(Australia).