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This open access book delves into 150 years of research on the Carnian Pluvial Episode (CPE) - a global climatic crisis during the Triassic period, occurring 233-235 million years ago. It explores how this ecological disaster, marked by massive volcanic activity and CO2 emissions, triggered dramatic climate shifts and a mass extinction in Mesozoic oceans. Evidence from rocks and fossils of the Alpine Triassic, particularly in Austria's Northern Calcareous Alps and the Styrian Eisenwurzen UNESCO Global Geopark, reveals the profound impact of this event on marine ecosystems. The narrow geological zone of the Reifling Basin, stretching from Moedling in Lower Austria to Grossreifling in Styria, exhibits exceptionally well preserved fossils, including ammonites, squids, mussels, crabs, fish, and even lungfish. Unique discoveries, such as the first evidence of squid cartilage and soft-tissue preservation, make this area a Konservat-Lagerstaetten belt with rare and invaluable sites for paleontological study. By analyzing these deposits, the book addresses critical questions: How did colossal volcanic events alter the global climate? What were the consequences for terrestrial and marine ecosystems? The CPE's global influence, spanning two million years, left behind marine sediments that offer glimpses into the greenhouse climate of the Late Triassic. Monsoon-like rains increased sediment runoff into oceans, suffocating reefs and depleting oxygen on the seafloor. With contributions from an international research team, this work combines historical insights with cutting-edge discoveries, offering a comprehensive view of a pivotal moment in Earth's history. It is an essential resource for understanding the interplay between volcanic activity, climate change, and mass extinction.