Early Holocene Gulf of California Time Series Data: readme file
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               World Data Center A- Paleoclimatology
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NOTE: PLEASE CITE ORIGINAL REFERENCES WHEN USING THIS DATA!!!

NAME OF DATA SET:  Early Holocene Gulf of California Time Series Data 
LAST UPDATE: 11/96 (Original Receipt by WDCA Paleo)  
CONTRIBUTORS: Jennifer Pike and Alan E.S. Kemp,
Department of Oceanography, University of Southampton, 
Southampton Oceanography Centre, European Way, Southampton, SO14 3ZH, UK 
Contact for further information:  Jennifer Pike, email jp1@soc.soton.ac.uk, 
FAX: +44 1703 593059, tel: +44 1703 596477.

IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 96-025
SUGGESTED DATA CITATION: 
Pike, J. and A.E.S. Kemp, Early Holocene Gulf of California Time Series Data,
IGBP PAGES/World Data Center-A for Paleoclimatology Data Contribution 
Series # 96-025.  NOAA/NGDC Paleoclimatology Program, Boulder CO, USA.
URL: ftp://ftp.ngdc.noaa.gov/paleo/contributions_by_author/pike1996

ORIGINAL REFERENCES:
Pike, J., 1996, High resolution palaeoceanography and palaeoclimatology 
from late Pleistocene and Holocene laminated sediments, Gulf of California,
Unpublished Ph.D. thesis, University of Southampton, Southampton, UK.


Pike, J. and Kemp, A. E. S.  1997.  Early Holocene decadal-scale ocean
variability recorded in Gulf of California laminated sediments.
Paleoceanography 12, 227-238.

GEOGRAPHIC REGION: Guaymas Basin, Gulf of California, NW Mexico 
PERIOD OF RECORD: Early Holocene, 9500-9200 cal yr BP 
LIST OF FILES: t-series.xls (Microsoft Excel 5.0 Macintosh format), 
t-series.csv (comma-delimited text), t-series.txt (ASCII text), 
pike1996.readme (this file).
DESCRIPTION:
Location of core:
JPC56 (27°28.16¹N; 112°06.26¹W).
Recovered in 1990 during R/V Atlantis II Leg 125/8.  
Co-chief scientists: Lloyd D. Keigwin (WHOI) and Robert C. Thunell (USC, Columbia).
Core JPC56 is archived at WHOI, USA.

Age range of time series:
JPC56, 502-552 cm below sea floor.  Early Holocene, 9500-9200 cal yr BP
(AMS radiocarbon ages supplied by L.D. Keigwin)

The data set represents a time series of lamina type and thickness from 
SEM backscattered electron imagery analysis of resin-embedded 
polished thin sections from the sediment section JPC56, 502-552 cm 
(Pike, 1996; Pike and Kemp, 1997).  Log Number represents the lamina/sub-lamina
identification number, where 1 is stratigraphically the youngest and 847b 
is the oldest.  These are not always consecutive (i.e. 46, 47, 50) 
because the number was originally assigned to the lamina by visual inspection
of the BSEI photomosaic.  When the section was logged using the SEM 
at high magnification, some laminae were seen to be the same composition 
as the adjacent lamina (thereby losing a Log Number), and others could be
split further (gaining a Log Number, i.e. 142a, 142b).  Lith. is the 
lamina/sub-lamina lithology: silt - silt and clay; M - mixed diatom flora; 
LC - large Coscinodiscus spp.; R - Rhizosolenia spp.;
S - Stephanopyxis palmeriana; C - Chaetoceros spp. resting spores;
T - Diatom mats; OM - other monospecific diatom flora; 
P - porous lamina, unidentified.  Thick is the thickness of the lamina/sub-lamina.
Yr. Thick is the thickness of the varve.  The value includes the laminae 
thicknesses above it, i.e. laminae 1-4 represent the first varve, 
laminae 5-7 the second varve etc.