History of the San Andreas Fault, Gaspar de Portola, Andrew Lawson, Alfred Wegener and Harry Hess. The San Andreas fault is about 28 million years old. Back then, California didn't exist, at least not recognizably so. Bits and pieces could be found scattered around the western edge of North American, which at the time ended at the Pacific ocean lapping the shores of central Utah and Arizona.
Sourdough bread is made by the fermentation of dough using naturally-occurring lactobacilli and yeast. Sourdough bread has a mildly sour taste not present in most breads made with baker's yeast, due to the lactic acid produced by the lactobacilli.ourdough is a dough containing a Lactobacillus culture in symbiotic combination with yeasts. It is one of the principal means of biological leavening in bread baking, the others using cultivated forms of yeast.
A sourdough starter, also called a pre-ferment, is a mixture of flour, water, and yeast, often wild yeast that occurs naturally. The starter is like a living organism that is cultivated over days and weeks, allowing it to develop a tangy flavor and other properties that helps the sourdough bread to rise.lour. To give your sourdough the best start, use organic whole wheat flour or rye flour. Beyond that, use unbleached bread flour to feed and maintain your starter. If you continue to use a whole grain flour to feed your starter, it may develop off flavors.