The Daly, which in its upper course is called the Katherine, is navigable for a considerable distance, and small vessels are able to ascend over 100 m.
Interesting speculations as to the periods of origin of great coral reefs have been made by Wayland Vaughan, Andrews and Daly and Humphreys.
Daly estimates that the maximum lowering of ocean level due to this cause would only amount to 36 fathoms, but even that would be the cause of very marked geological effects.
It was in 1882 while Marcus Daly was sinking a shaft at Anaconda in preparation for milling gold and silver ores that he discovered the first rich copper ledge.
Clark aspired to be a United States senator, but by ridiculing Daly, provoked a powerful opposition.
