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A fossil can be studied to determine what kind of organism it represents, how the organism lived, and how it was preserved. However, by itself a fossil has little meaning unless it is placed within some context. The age of the fossil must be determined so it can be compared to other fossil species from the same time period. Understanding the ages of related fossil species helps scientists piece together the evolutionary history of a group of organisms.

For example, based on the primate fossil record, scientists know that living primates evolved from fossil primates and that this evolutionary history took tens of millions of years. By comparing fossils of different primate species, scientists can examine how features changed and how primates evolved through time. However, the age of each fossil primate needs to be determined so that fossils of the same age found in different parts of the world and fossils of different ages can be compared.

Geologists have established a set of principles that can be applied to sedimentary and volcanic rocks that are exposed at the Earth's surface to determine the relative ages of geological events preserved in the rock record. For example, in the rocks exposed in the walls of the Grand Canyon (Figure 1) there are many horizontal layers, which are called strata. The study of strata is called stratigraphy , and using a few basic principles, it is possible to work out the relative ages of rocks.

As the summer wraps up, I got to write a post for AppFolio’s Engineering blog! It’s been a wonderful time, and I still have a week left to cherish.

Dungur Dungur 'Addi Kilte is the name of the ruins of a substantial mansion located in the western part of Aksum, Ethiopia, the former capital of the Kingdom of Aksum. These ruins are located in the western part of Aksum, across the Gondar road from the Gudit Stelae field. Dungur is known locally and popularly as the Palace of the Queen of Sheba (i.e. the Palace of Makeda in Ethiopia). However, Stuart Munro-Hay describes it as "the sort of dwelling that a prosperous Aksumite, perhaps a noble or high official of the fourth to sixth centuries AD, might have constructed for himself."

The Corpus separatum of Fiume (formally known as City of Fiume and its district) was the name of the legal and political status of the city of Fiume (modern Rijeka), instituted by Empress Maria Theresia in 1776, determining the semi-autonomous status of Fiume within the Habsburg Empire until the fall of the Austro-Hungarian Empire in 1918 – the longest-lasting known case of an actually implemented corpus separatum.

Lesson 8.3: True or False Name___________________ Class______________ Date________ Write true if the statement is true or false if the statement is false. _____ 1. Two common biotechnology techniques are gene cloning and genetic engineering. _____ 2. Gene cloning is the process of isolating and making copies of a chromosome. _____ 3. Biotechnology has raised ethical […]

Look absolute dating of rocks and fossils

A fossil can be studied to determine what kind of organism it represents, how the organism lived, and how it was preserved. However, by itself a fossil has little meaning unless it is placed within some context. The age of the fossil must be determined so it can be compared to other fossil species from the same time period. Understanding the ages of related fossil species helps scientists piece together the evolutionary history of a group of organisms.

For example, based on the primate fossil record, scientists know that living primates evolved from fossil primates and that this evolutionary history took tens of millions of years. By comparing fossils of different primate species, scientists can examine how features changed and how primates evolved through time. However, the age of each fossil primate needs to be determined so that fossils of the same age found in different parts of the world and fossils of different ages can be compared.

Geologists have established a set of principles that can be applied to sedimentary and volcanic rocks that are exposed at the Earth''s surface to determine the relative ages of geological events preserved in the rock record. For example, in the rocks exposed in the walls of the Grand Canyon (Figure 1) there are many horizontal layers, which are called strata. The study of strata is called stratigraphy , and using a few basic principles, it is possible to work out the relative ages of rocks.