All of these were drawn up in the period of the Amoraim, the order of teachers who succeeded the Tannaim, from the close of the Mishnah to about A.D.
It began, as a method, with the Sopherim (though there are traces in the Old Testament itself), and was most developed among the Tannaim and Amoraim, rivalling even the study of halakhah.
Both works were due to the Amoraim and were completed by about A.D.
The order of the Amoraim, which ended with the close of the Talmud (A.D.
Even in the time of the later Amoraim there is no mention of a written Palestinian Targum, though the official Babylonian Targum is repeatedly referred to in the Babylonian Talmud, in the Midrashim, and at times also by Palestinian Amoraim.