diff --git a/ontologies/index.html b/ontologies/index.html
index 316851d..a71b855 100644
--- a/ontologies/index.html
+++ b/ontologies/index.html
@@ -433,6 +433,36 @@ <h3 id="domain-ontologies">domain ontologies</h3>
 <td>Geo-ontology;<br />GeoSciML</td>
 </tr>
 <tr>
+<td><a href="http://resource.geosciml.org/ontology/timescale/gts">Geological Timescale Ontology</a></td>
+<td>[73,74]</td>
+<td>UML and OWL interpretation of the model implied by the International Chronostratigraphic Chart</td>
+<td>Conceptual Model; UML, OWL</td>
+<td>THORS;<br />GeoSciML</td>
+</tr>
+<tr>
+<tr>
+<td><a href="http://resource.geosciml.org/classifier/ics/ischart/">International Stratigraphic Chart Service</a></td>
+<td>[74]</td>
+<td>OWL implementation of the International Chronostratigraphic Chart</td>
+<td>OWL, SKOS</td>
+<td>Geological Timescale Ontology;<br />GeoSciML</td>
+</tr>
+<tr>
+<td><a href="http://def.seegrid.csiro.au/ontology/om/om-lite">OWL for Observations</a></td>
+<td>[75]</td>
+<td>OWL implementation of the Observations and Measurements model from ISO 19156</td>
+<td>Conceptual model, UML, OWL</td>
+<td> </td>
+</tr>
+<tr>
+<tr>
+<td><a href="http://def.seegrid.csiro.au/ontology/time/new">Generalized OWL-Time</a></td>
+<td>[76]</td>
+<td>Generalization of 2006 W3C OWL-Time to allow for non-Gregorian temporal reference systems</td>
+<td>OWL</td>
+<td> </td>
+</tr>
+<tr>
 <td>Geological Dating Ontology</td>
 <td>[49]</td>
 <td>Describes the main characteristics of geologic dating by absolute dating and relative methods using stratigraphic scales by linking between the Geological Time ontology and of the Basic Geology ontology</td>
diff --git a/refs/index.html b/refs/index.html
index e3ac3c0..7b4e597 100644
--- a/refs/index.html
+++ b/refs/index.html
@@ -443,6 +443,23 @@ <h4 id="51-75">51-75</h4>
 <td>[72]</td>
 <td>Krisnadhi A, Hu Y, Janowicz K, Hitzler P, Arko R, Carbotte S, et al. The GeoLink Framework for Pattern-based Linked Data Integration. Proceedings of 2015 International Semantic Web Conference, Bethlehem, PA: 2015.</td>
 </tr>
+<tr>
+<td>[73]</td>
+<td>Cox, S.J.D. and Richard, S.M. A formal model for the geologic time scale and global stratotype section and point, compatible with geospatial information transfer standards. Geosphere(2005),1(3):119, <a href="http://dx.doi.org/10.1130/GES00022.1">doi:10.1130/GES00022.1</a></td>
+</tr>
+<tr>
+<td>[74]</td>
+<td>Cox, S.J.D. and Richard, S.M.  A geologic timescale ontology and service.  Earth Sci Inform (2015) 8: 5. <a href="http://dx.doi.org/10.1007/s12145-014-0170-6">doi:10.1007/s12145-014-0170-6</a> </td>
+</tr>
+<tr>
+<td>[75]</td>
+<td>Cox, S.J.D. Ontology for observations and sampling features, with alignments to existing models.   Semantic Web, vol. 8, no. 3, pp. 453-470, 2017 <a href="http://www.semantic-web-journal.net/content/ontology-observations-and-sampling-features-alignments-existing-models-0">doi:10.3233/SW-160214</a> </td>
+</tr>
+<tr>
+<td>[76]</td>
+<td>Cox, S.J.D. Time Ontology Extended for Non-Gregorian Calendar Applications.  Semantic Web, vol. 7, no. 2, pp. 201-209, 2016 <a href="http://www.semantic-web-journal.net/content/time-ontology-extended-non-gregorian-calendar-applications-0">doi:10.3233/SW-150187</a> </td>
+</tr>
+
 </tbody>
 </table></div>
         </div>