2025年1月9日 · Geology, the fields of study concerned with the solid Earth. Included are sciences such as mineralogy, geodesy, and stratigraphy. Geology also explores geologic history, which provides a conceptual framework and overview of Earth’s evolution.

2025年1月9日 · Organisms preserved as fossils that lived over a relatively short span of geologic time and that were geographically widespread are particularly useful for stratigraphic correlation. These fossils are indexes of relative geologic age and may be termed index fossils.

2025年1月24日 · Triassic Period, in geologic time, the first period of the Mesozoic Era, lasting from 252 million to 201 million years ago. It marked the beginning of major changes that were to take place throughout the Mesozoic Era, particularly in the evolution of life and the distribution of continents and living things.

Paleoclimatology, scientific study of the climatic conditions of past geologic ages. Paleoclimatologists seek to explain climate variations for all parts of the Earth during any given geologic period, beginning with the time of the Earth’s formation.

2024年12月7日 · Minerals form in all geologic environments and thus under a wide range of chemical and physical conditions, such as varying temperature and pressure.

2025年1月3日 · Precambrian, period of time extending from about 4.6 billion years ago (the point at which Earth began to form) to the beginning of the Cambrian Period, approximately 541 million years ago. The Precambrian represents more than 80 percent of the total geologic record.

2025年1月24日 · Judging from modern conditions, a single large landmass such as Pangea would be expected to experience an extreme, strongly seasonal continental climate with hot summers and cold winters. Yet the paleoclimatic evidence is conflicting.

2025年1月24日 · Petroleum - Formation, Maturation, Kerogen: Deeper burial by continuing sedimentation, increasing temperatures, and advancing geologic age result in the mature stage of hydrocarbon formation, during which the full range of petroleum compounds is produced from kerogen and other precursors by thermal degradation and cracking (in which heavy ...

Quaternary, in the geologic history of Earth, a unit of time within the Cenozoic Era, beginning 2,588,000 years ago and continuing to the present day. The Quaternary has been characterized by several periods of glaciation (the “ice ages” of common lore), when ice …

2025年1月10日 · Seneca Polytechnic Pressbooks System - A Brief Introduction to Geology and Geomorphology - Weathering and Soils (Jan. 10, 2025) (Show more)