Changes

===Grain size===

===Grain size===

Terrigenous clastic grain sizes and carbonate rock types are recorded as a continuous vertical curve reflecting changes in depositional energy. Note that grain size increases to the left, as is inferred in the case of spontaneous potential (SP) and gamma ray curves. Grain size is determined by comparison with a chart made of sized sedimentary material or a visual pattern such as that produced by Amstrat. A good qualify handlens or reflecting light binocular microscope are essential for accurate grain size determination.

Terrigenous clastic grain sizes and carbonate rock types are recorded as a continuous vertical curve reflecting changes in depositional energy. Note that grain size increases to the left, as is inferred in the case of [[Basic open hole tools#Spontaneous potential|spontaneous potential (SP)]] and [[Basic open hole tools#Gamma ray|gamma ray]] curves. Grain size is determined by comparison with a chart made of sized sedimentary material or a visual pattern such as that produced by Amstrat. A good qualify handlens or reflecting light binocular microscope are essential for accurate grain size determination.

===Sedimentary structures===

===Sedimentary structures===