Figure F14. Main macroscopic and microscopic characteristics of Unit 4. A. Interval 203-1243B-8R-1, 29-40 cm. B. Sample 203-12437B-7R-2, 74-77 cm (PPL; field of view = 2.75 mm; photomicrograph 1243B-5). C. Sample 203-1243B-7R-2, 74-77 cm (XPL; field of view = 2.75 mm; photomicrograph 1243B-6). D. Sample 203-1243B-9R-2, 138-141 cm (PPL; field of view = 2.75 mm; photomicrograph 1243B-35).