May 19, 1992

Chris,

I enclose a floppy with the basic ostracode data from five Lake
Michigan Cores.  The identity of each core is shown in the file
name, which also refers to Steve Colman's core site number.  I
found the negatives of the ostracodes from Lake Michigan, but no
positives.  When Kelly returns I will ask him to make 8 X 10
copies of the most common species for you to scan.  The pictures
that I have enclosed are from another site.  FYI, the one with
two horns was caught emerging from a warm spring (hence a warm
underground area) located on the Satin Canyon Quadrangle in
Texas.

The headings on the spreadsheets are abbreviations for the
following:
DEPTH= DEPTH IN CM of the midpoint of the sample depth range.
AGE = ESTIMATED RADIOCARBON AGE USING STEVE COLMAN'S SPREADSHEET
FROM FEBRUARY 1992
CORRDEPTH= DEPTH CORRECTION ESTIMATES MADE BY STEVE COLMAN FROM
FEBRUARY 1992
WTSMPL= THE WET WEIGHT OF THE SEDIMENT SAMPLE THAT WAS PROCESSED
FOR OSTRACODES.
CSUBT= Candona subtriangulata, Benson and MacDonald, 1963
CCROG= Candona crogmaniana, Turner, 1894
CLAC= Cytherissa lacustris, (Sars, 1863)
CRAW= Candona rawsoni, Tressler, 1957
LFRIAB= Limnocythere friabilis, Benson and MacDonald, 1963
CDIST= Candona distincta, Furtos, 1933
CPARA= Candona paraohioensis, Staplin, 1963
CVIDUA= Cypridopsis vidua, (Mueller, 1776)
LITASCA= Limnocythere itasca, Cole, 1949
CACUTA= Candona acuta, Hoff, 1942
OTHERSPP= rare occurrences of one or more species lumped into
this generic category
TVALV= Total adult valves found in the sample
TVALV= the second Tvalv, is the total adult valves per gram of
wet sediment.
The first array of species numbers in each spreadsheet represents
the number of adult valves of the species indicated by the column
header that were found in the sample indicated by the depth value
at the beginning of the row.  The wet weight of that sample is
shown for all Holocene materials.  The second set of numbers
represent the number of adult valves per gram of wet sediment of
the species indicated by the column header that were found in a
sample indicated by the depth value at the beginning of the row. 
This concentration value is obtained by dividing the number of
adult valves per sample by the wet sediment wet.

If you need additional information my phone number is 8-303-236-
5656.  Data for other samples that were processed in my lab such
as the ones for stable oxygen isotope analyses or the ones for
radiocarbon dating are available from Steve Colman.

                                        Best regards


                                        Rick Forester