Callovian
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In the geologic timescale, the Callovian is an age and stage in the Middle Jurassic, lasting between 165.3 ± 1.1 Ma and 161.5 ± 1.0 Ma. It is the last stage of the Middle Jurassic, following the Bathonian and preceding the Oxfordian.
Matmor Formation (Callovian, Peltoceras athleta Zone) in Makhtesh Gadol, Israel.
Callovian rocks of the Osgodby Formation at Cayton Bay in North Yorkshire, England
Matmor Formation
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The Matmor Formation is a geologic formation of up to 100 metres (330 ft) thick, that is exposed in Hamakhtesh Hagadol in southern Israel. The Matmor Formation contains fossils from a Jurassic equatorial shallow marine environment. Bivalves, gastropods, sponges, corals, echinoderms, and sclerobionts are present in the Matmor Formation to various degrees. The stratigraphy of the Matmor Formation consists of alternating layers of limestone and marl.
Matmor Formation (foreground and middle ground) in Hamakhtesh Hagadol, Israel
Marls and limestones of the Matmor Formation exposed near the center of Makhtesh Gadol
Gastrochaenolites boring in a coral from the Matmor Formation
Calcarea sponge and encrusting crinoid from the Matmor Formation