Geology topics

C. Carroll

Publications and source records attributed to C. Carroll.

2 recordsLinked to original sources

USGS2006

State summaries: Colorado

According to the Colorado Geological Survey (CGS), Colorado's mining industry enjoyed a record-breaking year in 2005. For the whole year, the total value of nonfuel minerals, coal and uranium produced in the state in 2005 amounted to $2.4 billion. The production value of $1.52 billion in the nonfuel sector broke the previous record of $1.3 billion set in 1980, and is 60% higher than the revised 2004 CGS estimate of $950.5 million. The United States Geological Survey (USGS) ranked Colorado ninth among the states in nonfuel mineral value, up from 17th in 2004. About $1 billion of the nonfuel total is from metal mining. New record-high productions were achieved not only for molybdenum but also for coal and goal.

Mining Engineering↗

USGS2002

Incidence of Ichthyophonus hoferi in Puget Sound fishes and its increase with age of Pacific herring

A recent decrease in the mean age of adult Pacific herring Clupea pallasi in Puget Sound was associated with a high prevalence of Ichthyophonus hoferi , a protistan parasite that can be highly pathogenic to Pacific herring. In Puget Sound, high intensities of I. hoferi infection may be maintained in older cohorts of Pacific herring because the prevalence of I. hoferi increased with age from 12% among juveniles to 58% among the oldest, age-6 and older cohorts. Low intensities of I. hoferi infection in the region may be maintained in alternative fish hosts, such as surf smelt Hypomesus pretiosus , Puget Sound rockfish Sebastes emphaeus , Pacific tomcod Microgadus proximus , and speckled sanddab Cithanichthys stigmaeus .

Washington↗