To qualify for sick leave, an employee must: 1  Work for the same employer, on or after January 1, 2015, for at least 30 days within a year in California, and.  Satisfy a 90-day employment period (similar to a probationary period) before taking any sick leave.
In replacement fossils the body dissolves and minerals are left in its place. In permineralization, the water enters the cells of the organism and deposits minerals in the spaces inside them. Petrified wood is a permineralized fossil. Whole Body Fossils. Whole body fossils occur when an entire organism, including soft tissues, is preserved. Examples include insects entombed in tree sap, which hardens to become amber, and mammoths encased in ice. Footprints and Trackways. Footprints made by prehistoric animals walking through the mud sometimes harden and become fossils.
Fossils may also consist of the marks left behind by the organism while it was alive, such as animal tracks or feces (coprolites). These types of fossil are called trace fossils (or ichnofossils), as opposed to body fossils. fossil normally preserves only a portion of the deceased organism, usually that portion that was partially mineralized during life, such as the bones and teeth of vertebrates, or the chitinous or calcareous exoskeletons of invertebrates.