This article is about the bacterium. For the disease, see Salmonellosis. Salmonella /ËsÃ¦lmÉËnÉlÉ/ is a genus of rod-shaped (bacillus) gram-negative bacteria of the Enterobacteriaceae family. The two species of Salmonella are Salmonella enterica and Salmonella bongori. Salmonella enterica is the type species and is further divided into six subspecies that include over 2,500 serotypes. S. enterica subspecies are found worldwide in all warm-blooded animals, and in the environment.
The Four Geologic Eras. Geology is a complex and difficult subject, especially for the novice. I recommend that beginners first concentrate on the four major divisions of geologic history: the Geologic Eras.he Precambrian Era (4.6 billion years ago to 600 million years ago) encompasses the great majority of Earth's geologic history, stretching from the formation of our planet to the appearance of shelled marine life.
When exactly the geographical area that we call âthe Netherlandsâ first came into being, is difficult to say. There are times the area was totally flooded, and times when thick layers of sand or clay covered the Netherlands.The geological history of the Netherlands is made up of three parts: the Paleozoic, the Mesozoic and the Cenozoic.In this section, you can read about what happened to the Netherlands in each of these chapters. Finally, information is available about the developments during the last 10,000 years.hen exactly the geographical area that we call âthe Netherlandsâ first came into being, is difficult to say. There are times the area was totally flooded, and times when thick layers of sand or clay covered the Netherlands.