Palynologists separate pollen from sediments for correlation and paleoenvironmental reconstructions.
Typically, paleontological information is used in conjunction with other methods of relative or absolute age dating.
Paleontologists frequently work in conjunction with other scientists utilizing any number of other geochronology methods.
Biostratigraphy is the science of correlation of sedimentary units base on the identifiable fossils they contain.
Paleontologists examine fossils of all kinds, but micropaleontology (the study of microscopic organisms) is perhaps the most useful method of dating because the remains of tiny organisms tend to be better preserved, more widely distributed, and may provide more precise age determinations than larger shells or bone material.
The Sr geochronology method involves extracting these isotopes from fossil shell material (only several milligrams of sample are necessary for X-ray fluorescence spectroscopy).
The ratio of these two isotopes derived from a sample is compared with a database of known samples to determine relative ages.
A relative age of the original shell can be established by comparing the strontium isotope ratio of the shell material to published data for the time periods where this method is usable.