Since October is a celebration of the geological sciences (Year of Science) it seems appropriate to check the Directory of Open Access Journals for titles in the earth sciences. Here's the subject breakdown of journal titles in the DOAJ:
Geography (52 journals)
Geology (66 journals)
Geophysics and Geomagnetism (9 journals)
Meteorology and Climatology (20 journals)
Oceanography (21 journals)
Advances in Geosciences from the European Geosciences Union and Copernicus Publications is one of those general geology titles. From the publisher: "Advances in Geosciences (ADGEO) is an international, interdisciplinary journal for fast publication of collections of short, but self-contained communications in the Earth, planetary and solar system sciences..."
ADGEO has the Spark Europe seal, an indication that it uses Creative Commons license and provides metadata to the DOAJ, to ensure the widest possible harvesting of article content. In addition, ADGEO content may be archived in ADS: The Smithsonian/NASA Astrophysics Data System [example].