Geology is the study of the Earth, the materials of which it is made, the structure of those materials, and the processes acting upon them. It includes the study of organisms that have inhabited our planet. An important part of geology is the study of how Earth’s materials, structures, processes and organisms have changed over time.

What Does a Geologist Do? Geologists work to understand the history of our planet. The better they can understand Earth’s history the better they can foresee how events and processes of the past might influence the future.

In my case, I study  and I love work with Stratigraphy , is a understanding the variations in the successively layered character of rocks and their composition. These rocks may be sedimentary, volcanic, metamorphic or igneous. The layering of sedimentary rocks is expressed as sets of simple to complex sedimentary geometries, and a wide variety of different sedimentary facies. I building work sedimentary  models, is like a spatial          representation of the distribution of   sediments and rocks in the subsurface.

A.H  Santos basin, 2016

Sequence stratigraphy, a branch of sedimentarystratigraphy, deals with the order, or sequence, in which depositionally related stratalsuccessions (time-rock) units were laid down in the available space oraccommodation. The chronostratigraphy of sedimentary rocks tracks changes their character through geologic time. These changes may be shown in graphical form as either geologic cross sections and/or as chronostratigraphic correlation charts or Wheeler (1958, & 1964) diagrams. This is distinct from their geochronology or geologic age. The discipline of sequence stratigraphy provides a tool used interpret the depositional origin and predict the heterogeneity, extent and character of thelithofacies. This tool combines:

  • The framework of major depositional and erosional surfaces bounding these successions of strata.
  • The geometry that successive contemporaneous strata have following their accumulation.

This framework is most commonly interpreted to have been generated during changes in relative sea level when surfaces formed during the associated deposition and erosion. These surfaces, and the geometries of the sediments they envelope, are combined to interpret the depositional setting of clastic and carbonate sediments sediments, be they continental, marginal marine, basin margins and down-slope settings of basins. The interpretation is better, and predictions of local and regionalstratigraphy more accurate, when the sequence stratigraphic framework integrates accommodation successions with understanding of:

  • Steno’s Laws of sediment accumulation
  • Walther’s Law of the vertical and lateral equivalence of sediments
  • The chronology of the succession of strata forming the geologic section
  • Sedimentary structures