Geochemical data are generally derived from government and industry geochemical surveys that cover areas at various spatial resolutions. These survey data are difficult to assemble and integrate due to their heterogeneous mixture of media, size fractions, methods of digestion and analytical instrumentation. These assembled sets of data often contain thousands of observations with as many as 50 or more elements.

In this work, 60 specialists come together to discuss the regional occurrences of Jurassic rocks around the paleo-Pacific. Their tectonic settings, stratigraphic sequences, and fossil assemblages are covered in detail; regional biozones based on palynomorphs, protistans, plants, and invertebrates are defined; and superregional standard zones based on ammonites are established.

We began considering development of this book in 2010 while we were preparing a guidebook for a karst geology field trip. Our discussions resulted in realization that there are few, if any, karst areas in the world where so much research and investigation existed, especially when one considers that Florida’s near-surface carbonate rocks are eogenetic. That is, they have never been deeply buried or subjected to heat and pressure or had sufficient time to substantially alter their original textures and mineral contents.

The Khetri, Alwar and Lalsot-Khankhera Copper Belts contain widespread Cii±Au±Ag±Co±Fe±REE±U mineralisation over a 150x 150 km area of Rajasthan and Haryana, NW India. Mineralisation is hosted by the mid-Proterozoic Delhi Supergroup, which comprises shallow-water, locally evaporitic, sedimentary rocks, with lesser mafic and felsic volcanic rocks. These rocks have been metamorphosed to the low- to mid-amphibolite facies, defonned into NE-SW striking, doubly-plunging folds, and intruded by numerous 1.5-1.7 Ga syntectonic granitoids and 0.75-0.85 Ga post-tectonic granitoids. Post-tectonic granitoids range from tonalite to syenite, contain hornblende and biotite as the dominant mafic minerals and magnetite, titanite, allanite, apatite, fluorite as accessory phases, and are geochemically characterised by A/CNK ratios <1.1, low Al and Ca, high Th and HFSE, and enrichment in LREE, indicating A-type affinities.