| 词条 | Scratchgravel Hills |
| 释义 |
| name = Scratchgravel Hills | other_name = | photo = Lake Helena1.jpg | photo_size = 300px | photo_alt = | photo_caption = Scratchgravel Hills as viewed from Lake Helena | elevation = {{convert|5233|ft|m}} | elevation_m = | elevation_ft = | elevation_ref = | prominence = | prominence_m = | prominence_ft = | prominence_ref = | listing = | range = | parent_peak = | location = Lewis and Clark County, Montana | map = USA Montana | map_caption = | label = | label_position = | coordinates = {{coord|46|40|35|N|112|05|04|W|display=inline,title|name=Scratchgravel Hills}}[1] | coordinates_ref = | grid_ref_UK = | grid_ref_Ireland = | topo = | type = | volcanic_arc/belt = | age = | last_eruption = | first_ascent = | easiest_route = }} The Scratchgravel Hills, el. {{convert|5233|ft|m}} are a small summit of hills northwest of Helena in Lewis and Clark County, Montana. The area has seen increased development and a drop in water level in recent years. The Scratchgravel Hills have alluvial deposits on top of faulted granitic bedrock.[2] There was extensive mining in the area in late 1800s through the 1930s. The northern part of the region has folding shale, sandstone and limestone from the Algonkian (Belt) age. Adjacent granite has altered them into quartz-mica schist and related rocks. The southern and central portions of the region contains quartz monzonite.[3] Bitterroot and conifers are common in the area.[4] See also
Notes1. ^{{cite gnis |id=801422 |name=Scratchgravel Hills}} 2. ^{{cite web|title=GWIP Project Area: Scratchgravel Hills, Lewis and Clark County|format=PDF|work=Ground-Water Investigations Program|publisher=Montana Bureau of Mines and Geology, Montana Tech of the University of Montana|url=http://www.mbmg.mtech.edu/gwip/gwip_pdf/gwip_scratchgravelHillsFactSheet13.pdf|accessdate=September 24, 2011}} 3. ^{{cite web|title=Scratchgravel Hills Historical Context|publisher=Montana Department of Environmental Quality|url=http://deq.mt.gov/abandonedmines/linkdocs/104tech.mcpx|accessdate=September 24, 2011}} 4. ^{{cite web|title=Botanical Survey of the Scratchgravel Hills, Lewis and Clark County, Montana|format=PDF|publisher=Montana Natural Heritage Program|url=http://mtnhp.org/plants/reports/Scratchgravel.pdf|accessdate=September 24, 2011}} 1 : Landforms of Lewis and Clark County, Montana |
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