56. The Committee examined Document SC-91/CONF.002/10 and recommended that the Secretariat in co-operation with the International Union for Geological Sciences (IUGS), IUCN, and other experts proceed with the revision of the natural heritage criteria to reflect separately geological, biological, ecological and aesthetic phenomena and modify the requested conditions of integrity accordingly. The Committee requested the Secretariat and IUCN to co-operate in the revision of the natural heritage criteria and the conditions of integrity in order to submit draft proposals for the consideration ...