So what is it that interests you? If you can't answer this at least vaguely, then I have a hard time recommending grad school. Grad school takes focus, and is best served by knowing who and what you want to work with before you even send out your applications.

Important things to think about for grad school. Who, What and Where. And order is totally dependent on your ambition and preference.

Who to work with is based on how well you think you can work with someone. What it is they research, how much funding they have or if they could supervise a project on the periphery of their research are also important.

Best thing to do is contact them, but first get a little bit of familiarity with their body of work. Read a few of their abstracts and remember you don't get a PhD without an EGO, so stroke it and give a few compliments. Also try to get in touch with older students from that researcher's group to get a feel for their management style.

The younger a PhD is, the more they need to publish papers and will push you to research things they can publish, but they can also be energetic in their support and creativity. Older professors expect more self-direction generally, but they also can provide good contacts down the road if you continue in academia.

What is it that interests you about geology. Figure this out before grad school so you aren't starting over on a different project after a wasted year. Other people's projects will always sound more interesting than yours, get over it and drive on.

Where you can live is also important. Hot/Cold/Wet/Dry. This is all up to you, but keep in mind that your life doesn't end, even though that is how it feels most of the time. Seek Balance. You like live music, sports, the outdoors, skiing, beaches, etc.; make sure you aren't bereft of something true to you.