Independent Control for Present Time-Scales: GEOLOGICAL NOTES
The Paleozoic and Mesozoic rocks in the northcast pari of the basin are thrust from north to south onto the Tertiary rocks. The Eocene vol­ canic rocks in the south of the basin are thrustfaulted from south to north over the Upper Red formation. The basin is filled with Tertiary rocks, mostly Upper Red formation, and covered by Quaternary deposits over large areas. The recently developed faulting which was first observed after the earthquake shocks trends X. 80° W. and the maximum observed vertical displacement is about .50 centimeters. This recent fault has been traced for a distance of about 90 kilometers. The senior writer observed this fault in two localities south of Amirabad Xow (35°44'N. and 49°59'E.) and south of Yazan (35°44'N. and 49°43'E.). It passes south of Eypak (35°37'X. and 58°18'E.) and continues its course 3 kilo­ meters north of Rudak (35°41'X. and 49°53'E.) where it turns south and passes along an old fault —through Kuh-i-Sardab north of Rostamabad (35°40'X. and 49°S1.5'E.) and on into the Abassabad valley, finally dying out north of Ab-iGarm (35°45'N. and 49°17'E.). This recent fault is parallel with the general direction of the older faults (Fig. 2). In the mountainous area south of the Qazvin Basin there are sets of parallel faults with X. 80° W. orientation. The intermountain "basins" are limited by these faults. The main tectonic movement of the area began during Eocene and has continued to late Pliocene time and with minor tectonic activity to Recent. Also Recent earthquakes with concomitant fault­ ing attest the tectonic processes which have formed these younger mountains. In the Ab-i-Garm area and between the Kharaghan syncline and Mazlaghan Chai, Mesozoic rocks and partly fossiliferous Cretaceous rocks are exposed, for the most part in fault contact with Tertiary rocks. Xorth of Krafs (35°21'N.