In his book "The Natural History of the Point Reyes Peninsula", Jules Evens identifies several plant communities. One of the most prominent is the Coastal Douglas-fir ("Pseudotsuga menziesii") forest, which includes Coast live oak, Tanoak, and California bay and reaches across the southern half of Inverness Ridge toward Bolinas Lagoon. Unlogged parts of this Douglas-fir forest contain trees over 300 years old and up to in diameter. But despite these large, old trees, the forest may nevertheless be a result of European settlement. The Coast Miwok people who once lived in the area set frequent fires to clear brush and increase game animal populations, and early explorers' accounts describe the hills as bare and grassy. But as the Native American settlements were replaced by European ones from the seventeenth century onward, the forests expanded as fire frequency decreased, resulting in the forests we see today.