The Scratchgravel Hills, el. are a small summit of hills northwest of

Helena Helena may refer to: People *Helena (given name), a given name (including a list of people and characters with the name) *Katri Helena (born 1945), Finnish singer * Saint Helena (disambiguation), this includes places Places Greece * Helena ...

Lewis and Clark County, Montana Lewis and Clark County is a county located in the U.S. state of Montana. As of the 2020 census, the population was 70,973. Its county seat is Helena, the state capital. The numerical designation for Lewis and Clark County (used in the issuan ...

. 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. 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 Quartz monzonite is an intrusive, felsic, igneous rock that has an approximately equal proportion of orthoclase and plagioclase feldspars. It is typically a light colored phaneritic (coarse-grained) to porphyritic granitic rock. The plagioclase ...

Bitterroot Bitterroot (''Lewisia rediviva'') is a small perennial herb in the family Montiaceae. Its specific epithet ("revived, reborn") refers to its ability to regenerate from dry and seemingly dead roots. The genus '' Lewisia'' was moved in 2009 from ...

and conifers are common in the area.

Notes

{{reflist Landforms of Lewis and Clark County, Montana

See also

Notes