Disadvantages of rubidium strontium dating
Paleontologists frequently work in conjunction with other scientists utilizing any number of other geochronology methods.
Like fossils, the chemical and physical characteristics of rocks, minerals, and organic materials can be used for correlation.
Biostratigraphy is the science of correlation of sedimentary units base on the identifiable fossils they contain.
The ratio of these two isotopes derived from a sample is compared with a database of known samples to determine relative ages.
Tephrochronology is the study of volcanic ash deposits.
Volcanic ash layers often have unique chemical and physical characteristics that can be used for correlation.
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.
The method is most effective when used in conjunction with other dating methods. Stable Isotope Records - Stable isotope data derived from mineral and biological materials can provide a variety of insights into environmental conditions (past and present), and can be used in geochronology and correlation.
In addition to the chemical and physical characteristics of volcanic ash, select igneous minerals in the ash can be used for absolute dating (discussed below).