CHRONOS ADP

CHRONOS ADP statigraphic event data file format


The stratigrpahic event data file should be a tab-delimited plain text file containing identifying information, age, and depth values for the events (samples) in a core hole. Event depths may be specified directly as numbers, which are taken to be meters below sea floor (mbsf) or may be entered in core-section,cm format. Events may be assigned either a single age or an age range (minimum to maximum) and similarly either a single depth or a depth range. The opening lines of an example data file follow:

 278	2	5/7/91	CSC	Schrader	113+119+120
 Grp	Event           Plotcode	Y. Age	Old Age	Top depth	Bottom depth
 D	FAD N. curta    	bNc	3.64		"16-4,50"	"16-5,50"
 D	FAD A. parvulus   	bAp	4.58		"29-4,50"	"29-6,50"
 D	LAD N. donahuensis	tNd	5.84		"9-3,50"	"9-4,50 "
 D	FAD N. donahuensis	bNd	9.64		"12-2,50"	"12-3,50"
 D	FAD H. karstenii	bHk	9.64		"10-6,50"	"11-1,50"     

Like the core-depth data file, this file follows the format of the stratigraphic event files used in the original (Macintosh) ADP. The fields in the first line represent the hole ID, a program version number, a date, initials of the creator of the file, and some comments. The Java version of ADP displays this line following the Strat file info label at the top of the application, but does not try to process the line in any way, so its contents do not influence program behavior.

The second line contains headers for the seven columns of data, as a convenience for the human reader. The code skips over this line, so its contents are not crucial.

The third and following lines contain the data. Each line should contain seven tab-delimited fields, as follows:

Interpreting depths in core-section,cm format

Depths may be specified in core-section,cm format like "5-3,40" (the hyphen and comma are the required delimiters). This means 40 cm below the top of section 3 in core 5. The program assumes that each core is divided into consecutive 1.5-meter sections, so that the top of section 3 is 3.0 meters below the top of core 5. If the top of core 5 is at 60.0 mbsf, then the sample depth in this case is 60.0 + (3-1)*1.5 + 0.40 = 63.4 mbsf.

Depths may also be specified as core-catcher samples. For example, you could use "7-CC" to specify core-catcher samples for core 7. Core-catcher samples are assigned to the bottom depth of the core.

Clearly the core-depth data are required to interpret depths in core-section,cm format. If you cancel reading of the core-depth data file, then only events with depths given in mbsf will be displayed on the plot.