add Cox & Richard 2005 - formal model for geologic time scale

[brandonnodnarb]

[dr-shorthair]

This is addressed in #73 as well as the more recent OWL follow up

[brandonnodnarb]

re-visit before posting; does the provide coverage for https://github.com/dr-shorthair/GeologicTimeScale or are they considered separate? Is the answer simply application vs academic---i.e. the citation covers the work?

[dr-shorthair]

The 2005 paper is the conceptual model, formalized in UML, which became a module of GeoSciML.

The 2015 paper https://link.springer.com/article/10.1007/s12145-014-0170-6 is a re-interpretation of that into OWL.

https://github.com/dr-shorthair/GeologicTimeScale was where I had been working, but active development is now at https://github.com/GeoscienceAustralia/geosciml.org/tree/master/resource/static

The most recent changes have been to align the OWL implementation to OWL-Time https://www.w3.org/TR/owl-time/, as an alternative to the OWL implementation of the ISO 19108 UML model found at https://github.com/ISO-TC211/GOM/tree/master/isotc211_GOM_harmonizedOntology/19108/2006

The most recent version of the vocabulary uses OWL-Time https://github.com/GeoscienceAustralia/geosciml.org/blob/master/resource/static/vocabulary/timescale/isc2016-12-time.ttl