The subdivides the pelvis into the "true pelvis" and the "false pelvis".

Pelvic Brim

Explanation: The pelvis region is divided into two portions, one being false or greater pelvis, and other is true or lesser pelvis. False pelvis lies above the brim, and true pelvis lies below the brim and is part of the abdominal cavity. Pelvic brim is also termed as pelvic inlet. It is surrounded on three sides by the following regions-

Posterior: sacral promontory

Anterior: symphysis pubis

Lateral: Iliopectinial

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

hope this .. .

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