Relative dating sequence
Relative dating sequence - who is joannie rochette dating
It looks as though one group of layers was tilted and eroded away before new rocks were formed on top.
Carry on and place all the hammers on the correct layers.
Just as Sherlock Holmes used his power of observation to decipher the clues to a suspect's past actions, we will let the blemishes and behaviors of the rocks tell us their past story. ) Remember that relative dating involves determining "which came first" rather than "exactly when did this happen." The first step to untangling the geologic history of an area is often to figure out what happened first, second and third, etc.
without knowing the absolute ages at which the rocks themselves formed.
To review our principles of relative dating as applied to such geologic cross-sections, we will make use of a neat learning tool available on the Internet.
Cliffs, road cuts, and non-vegetated landscapes allow us glimpses into geology which is often hidden from view.
Cliffs and road cuts are "side views" or "geologic cross-sections" of the topography which show the relative positions of various rock layers and structures at a given spot.
Applying the principles of relative dating to these rock exposures (also called "outcrops"), we can reconstruct the sequence of events that created the geologic features which we see.Events can be the deposition of a sedimentary layer, the eruption of a lava flow, the intrusion of magma to form a batholith, a fault (break) in the rock that shifts one side relative to the other side (and causes an earthquake), a fold that bends and distorts rock layers, or any number of other geologic processes.The media on this page may not be supported on your device.To continue using the media on this page you may need to access this page on a computer that supports Quick Time video or Abobe Flash.The Sciencelearn Hub is in the process of converting most of the media to formats supported by touch devices, so please try accessing this resouce on your touch device at a later date. Help us work out the relative ages of the layers of sedimentary rocks.Remember that younger sedimentary rocks lie on top of older ones and were horizontal when formed.