Related by context. Frequent words. (Click for all words.) 76 Cretaceous 73 Paleozoic 71 Eocene 70 Late Cretaceous 67 Triassic 67 Jurassic 66 Miocene 66 Proterozoic 65 Precambrian 64 Pleistocene 63 Ordovician 62 Pliocene 61 Oligocene 60 Devonian 60 Cretaceous Period 59 sedimentary rocks 58 Quaternary 58 intrusive rocks 57 limestones 57 volcanic rocks 56 Archean 55 dinosaurs 55 stratigraphy 54 sedimentary 54 theropods 54 geologically 54 intrusives 54 volcanics 54 granitic 53 basalts 53 volcanism 53 fossils 53 sedimentary rock 53 banded iron 53 overlies 52 fossil 52 hydrothermal 52 gneiss 52 megafauna 52 diorite 52 sandstones 51 gabbro 51 mafic 51 metasediments 51 Tertiary 51 facies 51 sedimentary basin 51 Fossils 51 Paleolithic 51 Geologically 51 sauropod 50 peridotite 50 hydrothermal alteration 50 magmatic 50 felsic 50 vertebrate 50 glaciation 50 andesite 50 Holocene 50 paleo 50 massive sulphide mineralization 49 palaeontology 49 sediments 49 granites 49 breccia 49 sauropods 49 molybdenum mineralization 49 ultramafic 49 prehistoric 49 footwall 49 Mammals 48 caldera 48 Archaeopteryx 48 calcite 48 disseminated mineralization 48 carbonaceous 48 geologic 48 tyrannosaur 48 paleontologists 48 brecciated 48 shear zones 48 carbonate 48 ultramafic rocks 48 copper mineralization 48 sulphides 48 porphyry 48 stockwork 48 Mineralisation 48 mineralized vein 48 northwest trending 48 mineralization 48 dinosaur 47 hominids 47 epithermal gold silver 47 unconformity 47 granodiorite 47 carbonatite 47 crustal 47 siltstone 47 Australopithecus 47 northeast trending