Quaternary period

The Quaternary Period is the geologic time period from the end of the Pliocene Epoch roughly 1.806 million years ago to the present. The Quaternary includes 2 geologic subdivisions — the Pleistocene, including Gelasian that used to belong to Pliocene, and the Holocene Epochs. There is an ongoing debate of the status of Quaternary – a recent proposal from ICS was to make Quaternary a subperiod under Neogene, but that was retracted at criticism from INQUA, so instead ICS and INQUA agreed to erect Quaternary a subera, above Neogene, and to place the base for Quaternary at 2.588 ± 0.005, the base for Gelasian. However IUGS decided that Quarternary couldn't start within the epoch Pliocene thereby splitting it in two, so the decision is still awaiting settlement.
See more at Wikipedia.org...

Noun
1. last 2 million years
(synonym) Quaternary, Age of Man
(hypernym) period, geological period
(part-holonym) Cenozoic, Cenozoic era, Age of Mammals
(part-meronym) Holocene, Holocene epoch, Recent epoch

2-0 Million Years Ago
The second and last period of the Cenozoic era, this period is divided into two epochs: Pleistocene and Holocene. Mammoths roamed the lands. Cattle, deer, and of course, Homo habilis, Homo erectus, and Homo sapiens.
Wooly Mammoth(Mammuthus primigenius) 
Saber Tooth Cat 
Columbian Mammoth 
American Lion(Panthera Leo Atrox) 
Mastodon 
Bos Primigenius 
Coelodonta 
Dicerorhinus Kirchbergensis 
Arcodus simus 
Canis(lupis) 
see list of time periods

Geological Eras When H. P. Blavatsky was writing about the age of the earth in The Secret Doctrine she compared the teachings of the scientists of that time and found nothing but confusion and uncertainty as to geological figures. However, Professor Lefevre in his Philosophy adopted an original method of interpreting the data available. Instead of trying to reach exact figures in regard to the length of the entire fossil-bearing period of sedimentation from the Laurentian period to the present day, or of its subdivisions, he worked out the relative durations of the sedimentary deposits. With this for a background the actual duration of the eras and periods could easily be calculated when reliable evidence was found. Lefevre's studies were based on the erosion of rocks and the deposition of sediments, and his conclusions have stood with little modification till now. H. P. Blavatsky noticed that his estimates of the relative duration of the geological ages agreed fairly well with the 'esoteric' information in her possession, and so by adapting her knowledge of the real figures to Lefevre's proportional scale she constructed a time table which, she says, approximates the truth "in almost every particular." Her total of "320,000,000 years of sedimentation" is much less than that of modern geologists, even though she includes the Laurentian period in her table, which they omit. Her "Esoteric" table (Sd 2:710) is as follows:
to be continue "Geological Eras2 "

The second period of the Cenozoic Era, beginning two to three million years ago and continuing to the present time.