An introduction to sand and gravel deposit models, Front Range urban corridor

Preliminary report on deposit models for sand and gravel in the Cache la Poudre River valley

“…Samples for measurement of particle size and determination of pebble lithology, shape, roundness, physical quality, and chemical quality were collected from vertical trenches taken at one to three locations and from one or two horizons at each of eight gravel pits. Sample spacing was guided by results of earlier studies (Lindsey and Shary, 1997;Lindsey andothers, 1998a and1998b). Each sample was processed in the field by dry sieving and weighing size fractions.…”

“…Statistical models of deposit size (volume) can be prepared from dimensions of individual deposits shown on maps and cross-sections. Lindsey (1997) described five general geomorphic deposit models in the Colorado Front Range that reflect the map units utilized by Schwochow and others (1974a). These five models are dissected fans, high dissected terraces, high terraces, low terraces and modern floodplains, and eolian sand.…”

“…4) that were mapped by Schwochow and others (1974a) in the Cache la Poudre River valley between Fort Collins and Greeley, Colorado. From the highest (oldest) to lowest (youngest) the major landforms are dissected terraces, alluvial fans, high terraces, and floodplains and low terraces (Lindsey, 1997).…”

Gravel deposits of the South Platte River valley north of Denver, Colorado

“…Wind-formed dunes comprise a fourth landform of Quaternary age in the South Platte valley. The four landforms are the basis for corresponding aggregate deposit models (Lindsey, 1997). In the area studied, dissected high terraces are underlain by isolated erosional remnants of thin alluvial gravel deposits on hills overlooking the South Platte valley (Figure 2).…”

Preliminary report on aggregate use and permitting along the Colorado Front Range

“…Each area is a population center and market area with a radius of about 56-kilometers. TYPES OF AGGREGA AGGREGA AGGREGA AGGREGA AGGREGATE RESOURCES TE RESOURCES TE RESOURCES TE RESOURCES TE RESOURCES IN IN IN IN IN THE COLORADO FRONT THE COLORADO FRONT THE COLORADO FRONT THE COLORADO FRONT THE COLORADO FRONT RANGE RANGE RANGE RANGE RANGE Sand and gravel Sand and gravel Sand and gravel Sand and gravel Sand and gravel Lindsey (1997) described four general types of sand and gravel deposits in the Colorado Front Range ( fig. 2).…”