Monday, June 30, 2008
Yukon Island is across the bay from Homer. Most of it is rocky, but there are several pocket beaches and at the southeastern corner, a cuspate foreland (two spits or barriers converging to form a triangular shaped landform).
The geology (and terrain) divides dramatically from one side of Kachemak Bay to the other. Here it is a melange of older ocean floor and trench rocks, including these radialarian ribbon cherts from the mesozoic McHugh formation, formed from the exotic skeletons (they're cool - google images of radiolarians) of long-dead zooplankton settled out on the deep ocean floor and then thrust to the surface where geologic plates collided.