When J. Harlen Bretz first proposed in 1923 that the bizarre, deeply carved channels of the Columbia Plateau in eastern Washington—which he named the Channeled Scablands—were formed by sudden, catastrophic floods of biblical proportions, his peers reacted with immediate hostility. For decades, the dominant paradigm in geology was uniformitarianism: the belief that Earth’s landscape was shaped exclusively by slow, imperceptible processes like wind and normal river erosion. To Bretz's contemporaries, his 'catastrophism' sounded like a regressive leap back to pre-scientific, myth-based explanations of the Earth.
However, Bretz’s field evidence was meticulously detailed. He mapped giant gravel ripples, deep plunge pools, and massive coulees that could not be explained by gradual erosion. The establishment, led by the United States Geological Survey, organized a meeting in 1927 to debate Bretz's findings. The hosts did not invite Bretz to present his full data beforehand; instead, they invited him to what was effectively a trial, where a panel of established geologists systematically presented alternative uniformitarian explanations for each of his observations. Bretz stood his ground, pointing out that their theoretical models failed to account for the physical scale of the features he had mapped.
Based on the passage, which of the following best describes the relationship between Bretz’s geological field observations and the theoretical models of his contemporaries?
- Bretz rejected his contemporaries' models because those models were unable to account for the immense physical scale of the landscape features he had mapped.Answer
- BThe establishment geologists dismissed Bretz's observations outright because they believed the physical scale of the scablands was too insignificant to challenge uniformitarianism.
- CThe establishment geologists modified their theoretical models to incorporate Bretz's evidence of catastrophic flooding while maintaining a uniformitarian framework.
- DBretz adjusted his mapping of the gravel ripples and coulees to make his empirical data conform to the uniformitarian models presented at the 1927 meeting.