Another internal clock; preliminary estimates of growth rates based on cycles of algal boring activity

biogenic structures Bathurst Island Cenozoic algae Coral Sea Great Barrier Reef Cnidaria Invertebrata Kentucky Canada microfossils Northwest Territories sedimentary structures Devonian Holocene Lower Devonian Plantae Pacific Ocean paleontology Paleozoic Quaternary thallophytes Upper Ordovician Ordovician Porifera Southwest Pacific United States South Pacific West Pacific Western Canada