Improperly canned or home-prepared foods are common sources of the toxin that can result in foodborne botulism. Wound botulism results from contamination of a wound with toxin-producing C botulinum. Foodborne botulism and wound botulism occur predominantly in adults and are the focus of this article.C botulinum is an anaerobic gram-positive rod that survives in soil and marine sediment by forming spores.mproperly canned or home-prepared foods are common sources of the toxin that can result in foodborne botulism. Wound botulism results from contamination of a wound with toxin-producing C botulinum. Foodborne botulism and wound botulism occur predominantly in adults and are the focus of this article.
Scientists can not find the exact age of fossils. They use radioactive measures estimates of sedimentation and index fossils to date other fossils. The closest scientists can come to an exact date for a fossil is Carbon 14 dating. However since Carbon 14 has a half life of about 5,600 years Carbon 14 dating can only be used to date very recent fossils.
Typically commonly occurring fossils that had a widespread geographic distribution such as brachiopods, trilobites, and ammonites make the best index fossils. If the fossil you are trying to date occurs in the same layers as these index fossils, they can be used to narrow down the date, or date the rock formation. Another principal used in relative dating that rock layers are deposited sequentially.