Paleomagnetic dating is based on the fact that
Tradition paleontological and biostratigraphic correlation methods are still perhaps the most common relative dating methods used by geologists.
More modern correlation technologies include use of marine stable isotope records, paleomagnetic dating, tephrachronology, geomorphological methods, sedimentation characteristics, and other geochemical and radiometric methods.
Sediment cores from the main sedimentary basin in the Baltic Sea, the Gotland Deep, provide a high-resolution record of changes in the Holocene paleo-environment and paleoclimate.
Due to the inherent inaccuracy (reservoir effect, redeposited material) of the C dating method in dating marine sediments, the known changes in the Earth's magnetic field recorded in three sediment cores from the Gotland Deep were used to produce a more detailed and accurate timescale.
The most important tools for paleontologists are collections of fossils and paleontological reports (with fossil plates for identification) from other locations in the region or around the world.
Micropaleontologists and palynologists work with microscopes or scanning electron microscopes (SEM).
Paleontology is the study of life in past geologic periods (fossil plants and animals), incorporating knowledge of an organism's phylogeny, relationships to existing organisms, and correlation to an established chronology of Earth History.
Paleomagnetism can be used in conjunction with other correlation or dating methods to establish the age or rocks or to decipher changes in a rock's orientation through time.
In Menlo Park, contact: Dwayne Champion for more information about the paleomagnetic lab.
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.
Selected examples of correlation geochronology methods used by USGS scientists include: Paleomagnetic Dating - Under certain conditions, a record of the orientation of the Earth's magnetic field is preserved in rocks and sediments.