Geobiodiversity Database - formal database of ICS, which aims to produce comprehensive and authoritative web-based stratigraphic information service for global geoscientists, educators and the public
stratigraphy.net - aims to provide free and open access to geoscientific information and data with special emphasis on the disciplines stratigraphy, paleontology and sedimentology
Nacstrat.org - website for the North American Commission on Stratigraphic Nomenclature