Port Hueneme (pronounced Wy-nee'mee) is a seaside community in Ventura County, California. Port Hueneme is located 60 miles northwest of Los Angeles and 40 miles south of Santa Barbara. Today's Port Hueneme is located halfway between two larger Chumash settlements, today's Malibu and Ventura. The first post office in the community was in Wynema.
  Scientists study layers of rocks to learn about the earth and how it has changed. They know that if layers are undisturbed, the oldest rocks are on the bottom and the yo â¦ ungest rocks are on top.They know how old each layer is in relation to the other layers.+ 12 others found this useful. Scientists study layers of rocks to learn about the earth and how it has changed. They know that if layers are undisturbed, the oldest rocks are on the bottom and the yo â¦ ungest rocks are on top. They know how old each layer is in relation to the other layers. + 12 others found this useful.
So to determine the age of sedimentary rock layers, researchers first have to find neighboring layers of Earth that include igneous rock, such as volcanic ash. These layers are like bookends -- they give a beginning and an end to the period of time when the sedimentary rock formed. By using radiometric dating to determine the age of igneous brackets, researchers can accurately determine the age of the sedimentary layers between them. Using the basic ideas of bracketing and radiometric dating, researchers have determined the age of rock layers all over the world. This information has also helped determine the age of the Earth itself. While the oldest known rocks on Earth are about 3.5 billion years old, researchers have found zircon crystals that are 4.3 billion years old [source: USGS]. Based on the analysis of these samples, scientists estimate that the Earth itself is about 4.5 billion years old.