Graptolites, its general characteristics, morphology, geological range, preservation, environmental significance and occurence
GENERAL CHARACTERISTICS: PHYLUM: The Phylum of Graptolites is a class in the animal phylum Hemichordata. SUB-CLASS: The Graptolites belongs to Sub-class Graptolithia. ORDER i. Order Dendroidea (Cambrian-Pennslyvianian). ii. Order Graptoloidea (Ordovician-Devonian). iii . Order Conodontomorphia (Cambrian-Triassic). iv. Order Hyolithia (Cambrian-Permain). v. Order Tentaculidita (Ordovician-Devonian). vi. Order Conularia (Cambrian-Triassic). GEOLOGICAL RANGE: The geological range of the Graptolites is from the Upper Cambrian through the Lower Carboniferous i.e., (Mississippian). EARLY GRAPTOLITE: The early Graptolite known is Chaunograptus, from the Middle Cambrian. KINGDOM: The kingdom of Graptolites is Animalia. FIRST APPEARANCE: They first became apparent during the Cambrian period. Cryptograptus, early known graptolite, Silurian Age, South America. CLASS: The class of graptolites is Pterobranchia. SYMM