Dried, treated maize sold in Oaxaca , Mexico US quarter and Mexican peso shown for scale The ancient process of nixtamalization was first developed in Mesoamerica , where maize was originally cultivated. There is no precise date when the technology was developed, but the earliest evidence of nixtamalization is found in Guatemala's southern coast, with equipment dating from — BCE. In limestone regions like those in Guatemala and southern Mexico, heated chunks of limestone would naturally be used, and experiments show that hot limestone makes the cooking water sufficiently alkaline to cause nixtamalization. Archaeological evidence supporting this possibility has been found in southern Utah, United States. The Chibcha people to the north of the ancient Inca also used calcium hydroxide also known as "cal" , while the tribes of North America used naturally occurring sodium carbonate or ash. The nixtamalization process was very important in the early Mesoamerican diet, as unprocessed maize is deficient in free niacin.
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How might the Fairlight area have looked million years ago? Introduction Fairlight is a small village located a short distance from the coast between Pett Level half a mile to the north-east and Hastings 4 miles to the south-west. Over the years coastal erosion has consumed much of the village outskirts and several homes have already toppled over the cliff. A recent study revealed the cliffs had retreated over metres in the last century alone.
Geology[ edit ] The regular order of the occurrence of fossils in rock layers was discovered around by William Smith. While digging the Somerset Coal Canal in southwest England, he found that fossils were always in the same order in the rock layers. As he continued his job as a surveyor , he found the same patterns across England. He also found that certain animals were in only certain layers and that they were in the same layers all across England.