aapg.org Rank 215.6K. Estimated value 10,104$geokniga.org Rank 195.1K. Estimated value 11,172$rocktumbler.com Rank 1M. Estimated value 2,220$pnsn.org Rank 662.1K. Estimated value 3,264$geologyscience.com Rank 563.4K. Estimated value 3,840$leica-geosystems.com Rank 96.6K. Estimated value 22,704$emsc-csem.org Rank 66.1K. Estimated value 33,276$fossilera.com Rank 367.2K. Estimated value 5,904$raregoldnuggets.com Rank 1.4M. Estimated value 1,560$onegeology.org Rank 1.3M. Estimated value 1,620$