Yes, I think it is still pretty important for geosciences people (everybody in the sciences, really) to score as highly as they can on the quant GRE. Your percentile was 60%+, but when you apply, your score may very well be in the bottom half of all applicants for your program, especially for top schools. You want to give yourself as good a chance at getting in as possible, so if you believe you can do better than 670, then I would recommend you retake the exam.