Finding geology journals
You can find general online geology journals and also more specific journals on the topics of dynamic and structural geology, mineralogy, paleobotany, paleontology, paleozoology, petrology, and stratigraphy by searching for online journals.
Another trick for finding journals - both print and online - is to search the library catalog for the word "periodicals" in one box and "geology" (or mineralogy, or petrology, etc.) in another box.
High Impact Journals - Geology
High Impact Journals - Geosciences
What does "high impact" mean?
Briefly, high impact journals are important journals in a particular field. "Impact" refers to impact factor, a number determined by how many times articles from a particular journal have been cited. The more times people cite articles from that particular journal, the better. Impact factor is one of the most commonly used ways to determine the important journals in a particular field.