radiolarian chert造句

• Here radiolarian cherts overlie spilites and volcanic rocks.
• Radiolarian chert is exposed on certain south facing slopes of San Bruno Mountain and at Point San Bruno.
• The rock that forms the main peak of the island is radiolarian chert underlain by limestone and graywacke sandstone.
• The primary components of Headlands geology include graywacke sandstone, radiolarian chert, serpentinite, pillow basalts, and shale.
• A "'radiolarian chert "'is well-bedded, microcrystalline radiolarite that has a well-developed siliceous cement or groundmass.
• When siliceous oozes are incorporated into orogenic belts associated with subduction zones, they are also altered by diagenesis, and lithified to form chert, i . e . radiolarian chert.
• In the extreme northwest of the county between Drumlanrig Castle and Dalveen Pass in the south and the Spango and Kello Waters on the north, there is a broad development of Arenig, Liandeilo and Caradoc strata, represented by Radiolarian cherts, black shales, grits, conglomerates, greywackes and shales which rise from underneath the central Tarannon belt and are repeated by innumerable folds, in the cores of the arches of Arenig cherts there are diabase lavas, tuffs and agglomerates which are typically represented on Bail Hill east of Kirkconnel.