ESC 1000 Lecture Notes - Lecture 36: Ripple Marks, Varve, Kyanite
Document Summary
Made of organic carbon, the soft tissues of living things. Oil shale- shale with heat altered organic matter. Initial crystal growth in solution with recrystallization during burial. Form concentric rinds in open hollows of a rock to form agate. Overall arrangement of sediment into a sequence of beds. Moving across strata you will see alteration of sediment composition, grain size, and sorting. The fundamental unit of stratigraphy is a :formation Formation- beds that can be traced over a large region. Form from water or air flowing over loose sediment. Ripple marks- small ridges and troughs on cm scale. Dunes- large scale ripple marks (m-100s of meters high) Develop perpendicular to flow, used to determine flow direction in ancient sediments. Sediment moves down a slope as a pulse of turbid water producing graded beds in turbidite deposits. Occur after deposition while sediment is still soft. An annual layer of sediment or sedimentary rock.
