Quaternary
The Quaternary Period (/kwəˈtɜːrnəri/) is the current and most recent of the three periods of the Cenozoic Era in the geologic time scale of the International Commission on Stratigraphy (ICS). It follows the Neogene Period and spans from 2.588 ± 0.005 million years ago to the present. The Quaternary Period is divided into two epochs: the Pleistocene (2.588 million years ago to 11.7 thousand years ago) and the Holocene (11.7 thousand years ago to today). The informal term "Late Quaternary" refers to the past 0.5–1.0 million years.
The Quaternary period is typically defined by the cyclic growth and decay of continental ice sheets driven by Milankovitch cycles and the associated climate and environmental changes that occurred.
Research history
The term Quaternary ("fourth") was proposed by Giovanni Arduino in 1759 for alluvial deposits in the Po River valley in northern Italy. It was introduced by Jules Desnoyers in 1829 for sediments of France's Seine Basin that seemed clearly to be younger than Tertiary Period rocks.
Quaternary (EP)
Quaternary is an EP by the heavy metal band Mötley Crüe. It was released in 1994 on Elektra.
Background
The EP, which was initially going to be titled Leftovers, was made available as a mail-in offer for purchasers of the self-titled album Mötley Crüe in a limited quantity of 20,000 copies. The EP features one song from each member of the band ("Planet Boom" by Tommy Lee, "Bittersuite" by Mick Mars, "Father" by Nikki Sixx, and "Friends" by John Corabi), along with the song "Babykills" which is performed by the entire band. It is also the last Mötley Crüe release to feature singer John Corabi.
This release has since gone out of print. Songs 1-3 and 7 were reissued on the Supersonic and Demonic Relics compilation in 1999. Songs 1-2 were featured on the Red, White & Crüe compilation in 2005, and all the tracks were made available on the Music to Crash Your Car to: Vol. 2 box set in 2004.
The rap metal-influenced "Planet Boom" was later released on the soundtrack for Tommy Lee's then-wife Pamela Anderson's movie Barb Wire. However, the song was credited to Tommy Lee only, and the title was changed to "Welcome to Planet Boom". A video was also released for the song around the same time as the movie's release.
Quaternary (chemistry)
Quaternary is a term used in organic chemistry to classify various types of compounds (e. g. amines and ammonium salts).
See also
References
Podcasts:
