1. APPARATUS FOR SUB-SURFACE EXPLORATION, COMPRISING OSCILLATING ROTARY DRILLING MEANS INCLUDING AN INERTIA BARRAL, AN OSCILLATING MOTOR SUPPORTED AT THE END OF A WEIGHT CARRYING SUSPENSION MEANS TO PRODUCE STABLE MOVEMENT OF SAID DRILLING MEANS INTO THE FORMATION, AND MEANS FOR SUVEYING A SUB-SURFACE CHARACTERISTIC OF A FORMATION AS SAID DRILLING MEANS BORES INTO SAID FORMATION.

14. APPARATUS FOR SUB-SURFACE EXPLORATION, COMPRISING A ROTARY, OSCILLATING DRILL, MEANS FOR ENERGIZING SAID DRILL TO BORE INTO A FORMATION, MEANS MOUNTED ON SAID DRILL TO REMOVE A SAMPLE FROM THE BOREHOLE WALL OF THE FORMATION BEING DRILLED, SAID SAMPLING MEANS COMPRISING A CORE BARREL HAVING A BIT FOR CUTTING INTO THE FORMATION AND ARRANGED TO REMOVE A SUBSTANTIALLY VERTICAL CORE, SAID CORE BARREL BEING ROTATABLY DRIVEN TO REMOVE THE CORE AS SAID DRILL BORES INTO THE FORMATION.