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Geochronology and Isotope Geochemistry
Probability Density Function and Histogram for data with uncertainties 
Import data from Excel spreadsheets and calculate
the probability density function for the data and the histogram
representing the ages. May be used for large data sets which might
not be handled by other Excelbased packages. The pdf curve and
histogram values may be exported for publicationquality graphing
in other programs. Now also calculates stratigraphic, 'view from above'
probability plots for multiple samples or lithostratigraphic units to
illustrate detrital zircon ages relative to stratigraphic age and
cumulative probability curves. The latter are classified and colour
coded according to the scheme introduced by Cawood et al. (2012).

Extract 'raw' data from spreadsheets for DateView 
Import data from Excel spreadsheets for use in DateView database.
Collate and check data ready for import.

Geodate isotope software 
Isotope regression and calculation software.
Perform a variety of regression calculations, determine model ages,
initial ratios, epsilon or gamma values, weighted averages. Convert
zircon data (inluding error correlations) from Wetherill to
TeraWasserburg formats. Data may be read from custom GeoDate files
or imported from Excel spreadsheets. This 2016 version 4 program has been modified
to be suitable for use with Windows 7, 8 and 10 operating systems. A version is also under development
for Mac OS X.Most recent update of installation file posted 2016/07/11.Documentation for this software is available as
a pdf.
A new version of the documentation is being prepared and will be posted when available. 
UPb isotope open system modelling 
Forward model the effects of open system behaviour
in twostage UThPb isotope systems. Users may select a range in
238U/204Pb and 232Th/204Pb ratios at the time a system is disturbed
so as to investigate changes graphically. 
DateView
desktop geochronology database system 
Software for use in a desktop PC computer environment.
Users may compile geochronological information utilising a
usercustomisable database system which has an easy user interface.
The capabilities of this package have been described in
Eglington (2004) Computers and Geosciences, vol. 30, p847858.
The download provides an empty database (it does not include data
previously captured by the author). These data are now available
from the web version of DateView, which is available from the Database
page of this site. Documentation for this software is available as
a pdf. 
Geochemistry and Petrology
CIPW, meso and katanorm calculator 
Calculates CIPW, Meso and katanorms based on data
imported from Excel spreadsheets. In addition to providing normative
mineral compositions, the program calculates a variety of geochemical
projections and ratios often used during petrological investigations.
All calculated values may be exported to Excel spreadsheets for use
in other programs or for graphing.

Lithostratigraphy
South African lithostratigraphic database 
Userfriendly interface and database of South African
lithostratigraphic units. Formations compiled in this database are from
the South African Council for Geoscience's corporate database and include all formally
recognised stratigraphic units. Documentation for this software is available as
a pdf.
The contents of this desktop system
are now available online using the program StratDB, which can be found on the
database page of this site.

Geostatistics
Multivariate statistical analysis software 
Multivariate statistical analysis software for use
in exploratory data analysis. Data are read in from Excel spreadsheets.
Techniques incorporated in the package are: Simultaneous R and Qmode
component analysis; Principal component analysis; Correspondence
analysis; Discriminant analysis. Data may be transformed using
lognormal or centered logratio approaches prior to analysis. Various
nonparametric statistics are calculated and variables are portrayed
as histograms, sequence plots, quantilequantile plots and box plots.
Plots of sample locality (XYZ) may be produced with symbols coded
to EDA box plot classifications in order to assess the spatial
distribution of outliers. This version of the software is limited to
10 variables and 200 samples but users may contact
Bruce Eglington
to obtain a version capable of processing larger matrices.

Compare two curves with equivalent x axes 
Software facilitates the comparison of two curves
which have equivalent x axis parameters. For instance, one may wish
to compare two probability density curves derived from geochronological
investigations or compare two isotope proxy curves for a given time
period. this software utilises nonparametric geostatistical
techniques for the comparison. This is an alpha test version of the
software.

Compute weighted time variation curves 
Software calculates weighted and standard moving
averages for a data series. The weighted moving averages are based
on weighted splines curve fitting which takes analytical uncertainties
into account. The degree os smoothing is usercustomisable. Standard
moving averages may also be caclulated but are known to distort the
location of peaks in time series data as a function of the number of
points included in the moving average. This distortion is not present
when using the weighted moving average technique.

Mass spectrometer control, data reduction and diagnostics
Graphical
view of amplifier gain information for Thermo Triton and Neptune
instruments 
Software for use in a desktop PC computer environment.
Users should first convert the GainHistory.log file from either Triton or Neptune
instruments into MicroSoft Excel format (just open the original file and save
as an Excel file). This file is then imported into the GainLog program
and users may check out graphical views of the gain variation on different
amplifiers through time. 
 
