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The Blue Hills just west of Bremerton, Washington, also called the Bremerton Hills, Bald Hills, and Wildcat Hills, consist of Gold Mountain, Green Mountain, and several informally named hills.〔The United States Geological Survey's Geographic Names Information System lists Blue Hills as a "variant name" for Gold Mountain.〕〔A geological survey published in 1916 describes: "The Bald Hills constitute a prominent topographic feature of central Kitsap County. When viewed from a distance they stand in marked contrast to the prevailing level bench topography to the greater portion of the Puget Sound Basin ... Accessible exposures may be seen along the shores of Sinclair Inlet immediately southwest of Bremerton." 〕 Reaching an elevation of 1761 feet (537 meters), a thousand feet above the glacial till that fills the Puget Lowland,〔"The Puget Lowland is a north-south-trending structural basin that is flanked by Mesozoic and Tertiary rocks of the Cascade Range on the east and by Eocene rocks of the Olympic Mountains on the west." , and see Figure 1.〕 they form a prominent landmark visible around the region.〔; ; .〕 They are formed of uplifted blocks of marine basalts, the steep-walled canyons between the various summits being the fissures between the blocks (particularly prominent at Gold Creek and Union River). In addition to Gold Mountain and Green Mountain (the named members of the Blue Hills) are several other prominent peaks unofficially named according to their elevation (in feet): * Kitsap Lookout, el. 1,360 feet * (also known as Peak 1320),〔This ridge is identified as "(Peak 1320 )" at PeakBagger, and "Peak 1330" at List of John. The latter value is used here as LIDAR derived data indicates an elevation of 1340. 〕 * Peak 1291. * Peak 730. (For a fuller list of hills see List of mountains and hills of Kitsap County, Washington.) The name "Blue Hills" is said to come from the green trees appearing blue at a distance due to atmospheric optics. Image:BlueHillsWA-BowenVP.jpg|center|thumb|720px|View from Betty Bowen viewpoint (Queen Anne Hill, Seattle) west-southwest across Puget Sound and Bainbridge Island to the Blue Hills. Prominent summits from left to right are: Kitsap Lookout, Gold Mountain, Green Mountain, and Peak 1291. Behind these peaks of the Olympic Mountains trend to the south. From the right: Mt. Ellinor, Mt. Washington (elevation 6,250'), and Mt. Pershing. Barely overlooking Green Mountain: Lightning Peak and Dry Mountain. In the gap next to Gold Mountain the twin summits of Chapel Peak (~4,000') peek over Prospect Ridge (overlooks Lake Cushman). Visible to the left of Kitsap Lookout are several unnamed peaks in the vicinity of Vance Creek. Mouse-over for labels. See (Peakfinder.org ) for more details. # Image size: 1218x200 # # In error messages: imagemap line numbers include comment lines. # This should be line 5. # Areas defined first overlap areas defined later. poly 642 90 726 84 776 88 840 102 702 102 Peak 1330 poly 90 110 290 94 344 100 408 108 336 126 90 118 Peak 730 poly 108 108 152 90 224 78 264 74 306 80 408 106 Kitsap Lookout poly 366 94 438 68 540 80 590 98 388 100 Gold Mountain # Green Mountain has two lobes: merged. poly 642 94 674 80 726 74 778 86 826 80 850 88 974 90 1008 106 868 106 820 98 Green Mountain poly 1028 106 1078 94 1094 94 1154 100 1208 116 1054 116 Peak 1291 # Peaks of the Olympics: # poly 120 102 6 Dennie Ahl Hill Peak actually visible is unnamed. poly 550 84 574 76 590 86 628 86 644 94 592 96 Prospect Ridge circle 600 88 8 Chapel Peak circle 620 86 8 Chapel Peak circle 746 74 8 Dry Mountain circle 800 72 8 Lightning Peak circle 936 42 8 Mount Ellinor circle 994 32 8 Mount Washington circle 1158 36 8 Mount Pershing rect 62 154 130 164 Entrance to Blakely Harbor rect 1090 164 1218 180 Entrance to Eagle Harbor ==Geology== 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. (See Puget Sound faults#Geological setting.) File:Blue Hills (WA) GM wsp1413.jpg|left|thumb|upright=1.8|Geological map of central Kitsap County, Bremerton on the right. Purple is the uplifted bedrock that forms the Blue Hills. Distinct west-east fissure () separates Green and Gold Mountains (north and south, resp.). # Image size: 784x500 # # In error messages: imagemap line numbers include comment lines. # This should be line 5. # Areas defined first overlap areas defined later. # poly 264 3 286 3 292 10 282 40 292 50 288 76 276 98 238 110 216 108 174 122 170 116 204 94 232 100 268 84 274 56 262 28 272 12 #Big Beef Creek poly 158 116 170 118 174 128 154 138 156 146 140 150 132 136 148 128 #William Symington Lake poly 348 94 364 102 368 116 380 114 384 120 386 136 376 136 366 140 362 132 334 114 332 106 #Wildcat Lake poly 380 118 398 106 422 126 414 138 428 152 460 144 476 172 464 174 432 166 406 140 410 128 396 118 384 120 #Wildcat Creek poly 548 212 560 210 588 238 586 274 578 282 556 282 554 254 544 224 #Kitsap Lake poly 514 360 530 373 508 384 #Alexander Lake circle 310 442 12 #Calad Dam poly 366 370 376 372 360 404 332 414 316 444 308 440 324 408 354 394 #Union River Reservoir poly 308 444 312 446 308 460 318 498 308 498 298 488 292 464 #Union River poly 370 498 364 488 376 486 386 498 #Twin Lakes poly 156 420 174 430 184 450 172 470 166 456 152 442 140 448 134 442 146 434 #Mission Lake poly 118 260 128 264 130 278 138 290 140 304 136 312 132 306 122 292 106 290 116 278 #Lake Tahuya poly 70 498 58 480 80 472 100 490 #Panther Lake circle 222 204 10 #Tin Mine Lake poly 120 260 150 210 212 192 232 216 250 224 228 226 208 200 160 216 #Tin Mine Creek poly 136 208 140 302 154 308 168 332 240 328 274 310 300 320 300 330 160 338 #Gold Creek poly 132 304 136 308 128 344 112 358 84 352 38 394 46 446 40 462 16 498 2 498 2 478 32 434 18 404 18 390 78 342 114 338 #Tahuya River poly 194 156 210 156 210 176 184 196 170 198 176 178 #Peak 1107 poly 250 136 284 144 302 170 294 182 240 188 224 194 230 154 #Peak 1291 # Green Mountain has a north and a south lobe. poly 180 212 236 200 314 190 332 212 306 258 276 276 250 270 216 268 176 280 154 260 #Green Mountain poly 176 298 218 272 244 272 260 286 260 310 238 324 184 326 #Green Mountain poly 346 220 390 212 396 246 370 274 318 312 284 306 294 294 328 266 #Peak 1330 # poly 416 254 422 278 396 306 382 304 390 274 #Peak 11xx? # poly 392 318 438 316 426 346 398 348 274 356 366 350 372 330 #Peak 10xx? poly 138 346 154 344 150 368 136 384 122 380 120 364 #Peak 955 poly 168 334 344 332 364 368 352 392 300 450 264 432 208 424 146 396 170 366 #Gold Mountain poly 454 340 490 364 500 394 480 434 390 470 332 474 312 460 336 414 364 404 380 372 412 374 #Kitsap Lookout poly 572 320 602 324 602 392 630 374 638 422 602 446 552 430 534 414 528 386 #Peak 730 circle 578 464 26 #Gorst circle 550 54 26 #Chico (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). is formed of slightly older formations of gabbro and pegmatite, intruded by dikes of basalt and diabase. Most of the dikes are oriented north-northeast (NNE), suggesting they formed at a time of east-southeast–west-northwest (ESE-WNW) extension. This is parallel to the Olympic-Wallowa Lineament (OWL), a major regional feature that passes just north of Bremerton which some believe shows strike-slip (horizontal) motion, but a connection with the OWL is yet to be shown. Sharp downwarping of these formations has created numerous faults, including the dip-slip (vertical movement) Gold Creek fault that separates the two mountains. Strands of the Seattle fault, which east of here trend nearly due west-east, appear to turn to the southwest in the vicinity of Green Mountain.〔Geology from the Wildcat Lake geological map of and the revised version (showing major faults) of .〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Blue Hills (Washington)」の詳細全文を読む スポンサード リンク
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