Mīmāṃsā, extant perhaps as early as the 3rd cent. BCE, was later formulated by Jaimini in the Mīmāṃsā-sūtra (Mīmāṃsādarśana) which is the oldest and basic text of the Mīmāṃsā school. The Vedas are held to be eternal, uncreated, and need no further authority; any discrepancy within them, therefore, is only apparent.
After the 8th cent., two schools developed as a result of disputes over the interpretations of the commentaries of Kumārila and Prabhākara, noted teachers of Mīmāṃsā.
"Pūrva-mīmāṁsā." The Concise Oxford Dictionary of World Religions. . Encyclopedia.com. (August 15, 2018). http://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/purva-mimamsa
"Pūrva-mīmāṁsā." The Concise Oxford Dictionary of World Religions. . Retrieved August 15, 2018 from Encyclopedia.com: http://www.encyclopedia.com/religion/dictionaries-thesauruses-pictures-and-press-releases/purva-mimamsa