spaAlign: Stratigraphic Plug Alignment for Integrating Plug-Based and XRF
Data
Implements the Stratigraphic Plug Alignment (SPA) procedure for
integrating sparsely sampled plug-based measurements (e.g., total organic
carbon, porosity, mineralogy) with high-resolution X-ray fluorescence
(XRF) geochemical data. SPA uses linear interpolation via the base
approx() function with constrained extrapolation (rule = 1) to preserve
stratigraphic order and avoid estimation beyond observed depths. The
method aligns all datasets to a common depth grid, enabling high-resolution
multivariate analysis and stratigraphic interpretation of core-based
datasets such as those from the Utica and Point Pleasant formations.
See R Core Team (2025)
<https://stat.ethz.ch/R-manual/R-devel/library/stats/html/stats-package.html>
and Omodolor (2025)
<http://rave.ohiolink.edu/etdc/view?acc_num=case175262671767524>
for methodological background and geological context.
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[aut, cre],
Jeffrey M. Yarus [aut]