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Road log 4,102 Field trips 3,974 Guidebook 3,593 Paleozoic 1,862 Cenozoic 1,678 Areal geology 1,403 Sedimentary rocks 1,364 more ... Quaternary 1,067 Lithostratigraphy 1,048 Faults 1,040 Igneous rocks 991 Tectonics 915 Mesozoic 858 Tertiary 770 Stratigraphy 671 Carboniferous 667 Metal ores 645 Precambrian 644 Pleistocene 607 Sediments 593 Geomorphology 583 Metamorphic rocks 583 Volcanic rocks 572 Intrusions 569 Clastic rocks 565 Cretaceous 555 Sedimentary structures 515 Ordovician 492 Clastic sediments 475 Plutonic rocks 455 less ...