![]() ![]() Green Mountain is formed of slightly older formations of gabbro and pegmatite, intruded by dikes of basalt and diabase. Gold Mountain (on the south) is composed mainly of marine basalt flows and related volcaniclastic rocks (such as breccias and sedimentary interbeds) of the Crescent Formation, part of the Siletzia terrane that formed around 50 million years ago (early Eocene). Distinct west-east fissure ( Gold Creek) separates Green and Gold Mountains (north and south, resp.). ![]() Purple is the uplifted bedrock that forms the Blue Hills. Geological map of central Kitsap County, Bremerton on the right. (See Puget Sound faults#Geological setting.) The Blue Hills are perched on the north edge of the Seattle uplift, an east-west trending syncline or arch between the Seattle Fault and Tacoma Fault formed by north-south compression of the bedrock. (Excerpt from DGER Geological Map ( GM-52).) Geology Location of the Blue Hills ("OP") at west end of the Seattle Fault, and the similar Cougar, Squak, and Tiger mountains ("CL") at east end. Visible to the left of Kitsap Lookout are several unnamed peaks in the vicinity of Vance Creek. In the gap next to Gold Mountain the twin summits of Chapel Peak (~4,000') peek over Prospect Ridge (overlooks Lake Cushman). Barely overlooking Green Mountain: Lightning Peak and Dry Mountain. Behind these peaks of the Olympic Mountains trend to the south. Prominent summits from left to right are: Kitsap Lookout, Gold Mountain, Green Mountain, and Peak 1291. ![]() View from Betty Bowen viewpoint ( Queen Anne Hill, Seattle) west-southwest across Puget Sound and Bainbridge Island to the Blue Hills. The name "Blue Hills" is said to come from the green trees appearing blue at a distance due to atmospheric optics.
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