Summary for Field Activity Number 1989-015-FA

Alternate Leg ID: LAUR89-1

Area of Operations: Lake Michigan, Michigan, Illinois, Great Lakes, United States, North America

Dates: June 13, 1989 to June 18, 1989

Objectives: Collection of seismic reflection data and cores in Lake Michigan to define the stratigraphy and sediment character of the deposits below the lake floor. The last year's seismic reflection data was used to choose core locations for this cruise and to define areas where new seismic reflection data were needed. New gravity and box cores were obtained at most of the sites that were piston cored or vibracored last year, and a number of new core sites were established. These cores will be used to develop a closely dated record of sedimentation and paleoenvironmental conditions in the lake. The cores and the seismic reflection data together will be used to determine the history of lake-level fluctuations over the last several thousand years.

Type of Activity: Seismic profiling
coring

Information to be derived: Grain size analysis
Morphology

Summary: Box cores: 18; Gravity cores: 14; Seismic tracklines: 18.

USGS Project Number: GREAT LAKES

Contact: Steve Colman (scolman@usgs.gov)

InfoBank: uses the identifier L-1-89-LM. Visit this site for more information.