post depositional structures Flashcards
structures due to sed instabilities, result of displacement of and movement of unconsolidated seds, and are found in areas of steep slopes and fast sedimentation rate
slump
structure due to liquefaction
convolute bedding
structure due to fluidization, consist of a concave-up laminae separated by a structure less zones called pillars
dish and pillar
due to fluidization, sheet-like vetical bodies which is made up of fine sand and they typically cross-cut other beds
calstic dykes
liquefied sediment brought to the surface in isolated pipes
sand volcanoes
spread out sand brought to the surface by clastic dykes
extruded sheets
common on the soles of a sandstone bed overlying a mudrock occurs as bulbous, rounded structures,
load cast
form when mud is injected upward into the sand
flame structures
result of loading, where bed sinks into the underlying mud and break up into discrete masses
ball and pillows
occurs due to the density contrast is large and kiw density material is relatively mobile
diapirs (mud or salt)
local patches of sedimentation
nodules
fan shaped fibrous calcite crystals in fan
cone-in structures
calcareous nodules
calcrete
sutured planes in a bed
stylolites
precipitation of manganese and iron oxides
dendrites
