At the start of the triassic, most of the continents were above sea level, and sediments from that time are often red because

In this case sedimentary rocks are color red because the rocks contains iron oxides. These rocks are also called red beds because of its color. Iron oxides is a composition of both iron and oxygen. Examples of red beds are sandstones, shale, and siltstone.

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can you make it bigger i can't see it