User talk:Gcolman15

A Group of small floating, aquatic, colonial animals that first appeared during the Cambrian Period, graptolites became extinct during the Carboniferous Period. They had a fingernail-like outer covering and no mineralized hard parts. They are most frequently preserved as carbonaceous impressions on black shales, although they are sometimes found in limestones. They had one or more branches, and are easily mistaken for fossil plants rather than animals. They underwent distinct evolutionary changes over time, making them very useful for age-dating rockshttp://2.bp.blogspot.com/_ZHv_I4h7INY/TF70_lHIJZI/AAAAAAAAEsE/Qas9p6Wj3b0/s1600/graptolites---kope-formation---ordovician-period---carroll-county-kentucky-magnified-40x.jpg

Graptolites
A Group of small floating, aquatic, colonial animals that first appeared during the Cambrian Period, graptolites became extinct during the Carboniferous Period. They had a fingernail-like outer covering and no mineralized hard parts. They are most frequently preserved as carbonaceous impressions on black shales, although they are sometimes found in limestones. They had one or more branches, and are easily mistaken for fossil plants rather than animals. They underwent distinct evolutionary changes over time, making them very useful for age-dating