Prior to 2009, the Pleistocene was defined to be 1. 805 million years ago to present, such that the present definition of the Pleistocene includes a portion of what was prior to 2009 defined as part of the Pliocene.

Prior to the Spanish conquest ( 1519 – 1522 ) most of present day Mexico formed the Aztec Empire, a native American empire ruled from Tenochtitlán ( present day Mexico City ) by a tlatoani or " emperor ".

Prior to the encroachment of white settlers in present day Sevier County in the mid-18th century, the area had been inhabited for as many as 20, 000 years by nomadic and semi-nomadic Native Americans.

Prior to the United States ' involvement in the conflict, construction began on MacDill Field, the predecessor of present day MacDill Air Force Base.

Prior to the 19th century the area now forming the Borough was practically unoccupied: very few of the present settlements were mentioned in the Domesday Book, although the village of Bexley has a charter dated 814CE.

Prior to the island being declared a national park, many of the historical cement works buildings were demolished due to the danger the government thought the buildings would present to tourists.

Prior to the plat of the village, there was an inn three-quarters of a mile east of the present site, called " Tantivy " or " TAN-TI-VY ".

Prior to this time, many early ranchers had driven cattle over the Great Western Cattle Trail from Texas to Dodge City, Kansas, the present townsite of Elk City being in the direct path of that famous trail.

Prior to the last Ice Age, the River Thames followed a more northerly route to the North Sea, from Reading via Marlow, Chorleywood, St Albans, Hertford and along the present Suffolk-Essex border.

Prior to 1889, the name was written " Skiaker ", then from 1889-1910 it was spelled " Skiaaker ", from 1911-1920 it was " Skjaak ", and since 1921 it has been written in its present form, " Skjåk ".

Prior to the settlement of the city, an Ojibwa village existed near the present hospital site on the lake's shoreline.

Prior to the American Civil War, a portion of the present campus was the property of the Bullard family of Natchitoches.

Prior to 1976 it was part of the Diwaniya Province, which also included present day Al Muthanna Governorate and Al-Qādisiyyah Governorate.

Prior to 1978, the capital statute of Ohio had placed limitations on what mitigating factors the defense could present during sentencing.

Prior to its incorporation in 1834, the first settlements in the village were to the east of the present village site.

Prior to the enactment of the Canadian Charter of Rights and Freedoms in 1982 ( and continuing to the present day ), it was fairly common for a provincial law to be challenged on the grounds that it was a criminal statute, and thus ultra vires or beyond the province's legislative authority.

Prior to departing with that performance, he was present at the American Indian Congress in Omaha, Nebraska, where all his known photographs were taken.

A problem in meaning arises in the study of Prior Analytics for the word " syllogism " as used by Aristotle in general does not carry the same narrow connotation as it does at present ; Aristotle defines this term in a way that would apply to a wide range of valid arguments.

At present, " syllogism " is used exclusively as the method used to reach a conclusion which is really the narrow sense in which it is used in the Prior Analytics dealing as it does with a much narrower class of arguments closely resembling the " syllogisms " of traditional logic texts: two premises followed by a conclusion each of which is a categorial sentence containing all together three terms, two extremes which appear in the conclusion and one middle term which appears in both premises but not in the conclusion.

Prior to the rise of Theravada Buddhism, both Indian Brahmanic religion and Mahayana Buddhism were present in Thailand.

Prior to his present position, Bartoe was Director of Operations and Utilization in the Space Station Office of NASA Headquarters from 1990 to 1994.

Prior to 20, 000 years before the present, an ancestral Passaic River flowed through a gap in these ridges.

Prior to correction of an ASD, an evaluation is made of the severity of the individual's pulmonary hypertension ( If present at all ) and whether it is reversible ( Closure of an ASD may be recommended for prevention purposes, to avoid such a complication in the first place.

Prior to this — before the Second World War — he was content with the role of an apolitical liberal intellectual: " Now teaching at a lycée in Laon [...] Sartre made his headquarters the Dome café at the crossing of Montparnasse and Raspail boulevards.

Prior to 1931, eleven times the Preakness was run before the Derby.

Prior to the 1980s, heroin was typically transported from Burma to Thailand, before being trafficked by sea to Hong Kong, which was and still remains the major transit point at which heroin enters the international market.

Prior to the discovery of the Rosetta Stone and its eventual decipherment, there had been no understanding of the Ancient Egyptian language and script since shortly before the fall of the Roman Empire.

Prior to Return to Flight, NASA Administrator Sean O ' Keefe declared that all future flights of the shuttle would go to the ISS, precluding the possibility of executing the final Hubble Space Telescope servicing mission which had been scheduled before the Columbia accident, despite the fact that millions of dollars worth of upgrade equipment for Hubble were ready and waiting in NASA warehouses.

Prior to the Phanerozoic ( before 544 Ma ), it is believed that microbial or inorganic processes weakly regulated the ocean's silicon cycle .< ref name = grenne03 > Subsequently, the cycle appears dominated ( and more strongly regulated ) by the radiolarians and siliceous sponges, the former as zooplankton, the latter as sedentary filter feeders primarily on the continental shelves.

Prior to 1932, the Preakness was run before the Derby eleven times.

Prior to 1931, eleven times the Preakness was run before the Derby.

He took a year to consider what action to take, before writing to the Prior of Bath in October 1500 to explain that a large amount of the priory income would be dedicated to rebuilding the cathedral.

Prior to this, between 1947 and 1998, it was the capital of the Bydgoszcz Voivodeship, and before that, of the Pomeranian Voivodeship between 1945 and 1947.

Prior to public service, McNamara was one of the " Whiz Kids " who helped rebuild Ford Motor Company after World War II, and briefly served as Ford's President before becoming Secretary of Defense.

Prior to the redevelopment of the Melbourne Cricket Ground between 2002 and 2006, spectators seated in the Members ' Stand ( reserved for members of the Melbourne Cricket Club ) would not participate in a Mexican wave, and would be booed by other spectators at the ground, before the wave would resume on the other side of the stand.

Prior to Ipsus, he had never before lost a battle.

Prior to 1229, Heston was part of the parish of Gistleworth ( Isleworth ) before being taken by Henry III, who subsequently granted it to the Earl of Cornwall.

Prior to Marcellus, the spolia opima was not of special importance in the minds of Romans because it had happened only twice before, if at all.

Prior to that time, the territory now included in Badger Township was within the watershed of the Red River Valley and hence technically a part of Rupert's Land and Assiniboia before becoming part of British Canada as a result of the boundary settlement in the Treaty of 1818, a which fixed the international border at the 49th parallel north from the Northwest Angle of Lake of the Woods westward to the Rocky Mountains.

Prior to 1929, high school students attended Central High School in Paterson, before the Board of Education voted to send students to Ramsey High School in Ramsey instead.

Prior to MRP, and before computers dominated industry, reorder-point / reorder-quantity ( ROP / ROQ ) type methods like EOQ ( Economic Order Quantity ) had been used in manufacturing and inventory management.

Prior to the 1820s, Norwich was served by vessels using the River Yare, which flows through Breydon Water before joining the River Bure and then the North Sea near Great Yarmouth.

Prior to the end of the last ice age the Purbeck Hills were continuous with the Isle of Wight and the Frome would have continued east through what is now Poole Harbour and Poole Bay, into The Solent, collecting the Stour, Beaulieu, Test and Itchen, before flowing into the Channel east of what is now the Isle of Wight.

Prior to 1918, the name was written " Saude " or ( before 1862 ) " Søfde ".

Prior to Keith's signing with Sparrow Records and two years before the release of " No Compromise ", Tommy James ( of Tommy James and the Shondells ) released " Don't Wanna Fall Away From You " on his 1976 Fantasy album titled " In Touch ".

Prior to a discussion of his raids against the Japanese positions in the Marshall Islands, Halsey told the young midshipmen before him, " Missing the Battle of Midway has been the greatest disappointment of my career, but I am going back to the Pacific where I intend personally to have a crack at those yellow bellied sons of bitches and their carriers ," to the rousing applause of the assembled midshipmen.

Prior to Warren Mears ' first appearance, he attended Sunnydale High for a semester at the same time as Willow, Xander, and Buffy, before leaving Sunnydale to attend a tech college over in Dutton.

Prior to this, wine would be sold by the barrel ( and before that, the amphora ) and put into bottles only at the merchant's shop, if at all.