Many people are aware that trees can be dated by counting the layers of tree rings in a cross section. But, less folks know that fish, snails, mussels, and the teeth of many local mammal species build seasonal growth rings that are used to age individuals.
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Many people are aware that trees can be dated by counting the layers of tree rings in a cross section. But, less folks know that fish, snails, mussels, and the teeth of many local mammal species build seasonal growth rings that are used to age individuals.
Apple cultivars brought as seed from Europe were spread along Native American trade routes, as well as being cultivated on colonial farms. By the mid 1800s, United States apples nursery catalogues sold 350 of the "best" cultivars, showing the proliferation of new North American cultivars by the 19th century.
WXPR Field Notes
Many people are aware that trees can be dated by counting the layers of tree rings in a cross section. But, less folks know that fish, snails, mussels, and the teeth of many local mammal species build seasonal growth rings that are used to age individuals.
