ROCHES SILICEUSES : Diatomite, silex... (par Mme Ruault-Djerrab)

This video presents some samples of siliceous sedimentary rocks (such as diatomite, radiolarite, flint) and explains the conditions of their formation. These rocks are rich in silica of biological origin (= primary rocks formed following the accumulation of siliceous elements of biological origin) or chemical (= secondary rocks formed during diagenesis like flint). This video has been put online for beginners in geology, in particular in License 1 and 2 at the University, or for high school students in science. It allows you to revise the notions learned during the Petrology practical work. Video highlights: 0:07: Introduction 0:55: Primary rocks (layered rocks) 4:32: Siliceous accidents (nodules) For more details on sedimentary geology, consult the site: http://djerrab-geologie-guelma.e-mons... To see all the photos featured in my videos (and more), check out my photo site: https://adjerrab.wixsite.com/photo-ge...