“ The boundary between the state of Texas and the state of Oklahoma consituting the eastern boundary of the Panhandle of Texas and the main western boundary of Oklahoma, is the line of the true one-hundredth meridian of longitude west from Greenwich, extending north from its intersection with the south bank of the South fork of Red river to its intersection with the northern boundary line of the state of Texas as surveyed and marked upon the ground by John H. Clark, United States commissioner, under the Act of June 5, 1858, c. ”