Geologists determined the division of the geologic time scale through the study of rock layers and the fossils contained within them. By examining the different types of fossils and their distribution in the rock record, geologists were able to identify distinct time periods based on changes in the Earth's environment and the evolution of life forms. This process of relative dating helped establish the framework for the geologic time scale.
Sharks existed at the same time dinosaurs did. Sharks pre-date the dinosaurs by quite a bit. To get from sharks to dinosaurs: sharks - bony fish - lobe finned fish - lung fish - amphibians - reptiles - dinosaurs.
The Mesozoic era is often referred to as the "Age of Reptiles" due to the dominance of reptiles, including dinosaurs, during this time period.
the record of life forms and geologic events in earth's history is actually called the "Geologic time scale" fine sir. good day
No. All reptiles, both on land and in water, must breath air. Marine reptiles can hold their breath from a considerable time, but must surface to breathe once in a while.
Period.
epoch
Eon is the broadest division on the geologic time scale, representing the longest time span. Eons are further divided into eras, which are then subdivided into periods, epochs, and ages.
The third largest division of geologic time is an era. The eras are further divided into periods, epochs, and ages.
Eon
Epoch
The next smaller division of geologic time after era is period. Periods are further divided into smaller units called epochs.
Precambrian time
The shortest division in the geologic time scale is an Epoch. Epochs are subdivisions of a period and are typically tens of millions of years long.
No, rattlesnakes are a fairly recent family of reptiles to develop, at least when one looks at geologic time.
A long span of geologic time is called an era. This is a major division of geologic time that is further subdivided into periods. Examples of eras include the Paleozoic, Mesozoic, and Cenozoic.
an era uhm NO ^ an eon . (apex)