Ninety percent of radiolarian species are extinct. Near the summit you will find folded layers of very hard rock called radiolarian chert. Near the summit are folded layers of very hard rock called radiolarian chert. For example, there are diatom, coccolith, foraminifera, globigerina, pteropod, and radiolarian oozes. A copy of Haeckel's illustration for this radiolarian appears in the article on regular polyhedra. It is in fact astonishing that any radiolarian tests survive at all. Radiolarites are composed mainly of radiolarian tests and their fragments. The layers reveal an interchange of clastic mica grains, radiolarian tests, carbonates and organic pigments. Here radiolarian cherts overlie spilites and volcanic rocks. Biogenic pelagic silica sediments consist of radiolarian, diatomaceous, silicoflagellate oozes, and chert. The three volumes of "The Radiolarian Series" were first released as three separate albums. The true "Zooxanthella" K.brandt is a mutualist of the radiolarian "Collozoum inerme" (Joh. In more lime-rich sections four radiolarian faunal associations were identified. In radiolarian oozes deposited in the equatorial Eastern Atlantic 11.5 meters/million years have been measured. Some common radiolarian fossils include "Actinomma", "Heliosphaera" and "Hexadoridium".