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Flower R.H.1964, The
Nautiloid Order Ellesmerocerida (Cephalopoda) Menoir 12, New Mexico Bureau of Mines and Mineral Resources, Socorro, NM
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Harland, W. B. et al1 990. A Geologic Time Scale 1989. Cambridge
University Press, Cambridge . Ref in Paleobiology Database on line.
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Chen Jun-yuan & Teichert C, 1983; Cambrian
Cephalopods, Geology Vol 11, pp647β650, Nov 1983
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with a span of nearly 4.5 million years, from about 497 to 492.5
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256:. You can help Knowledge by
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182:. The name comes from the
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303:Cambrian geochronology
201:and followed by the
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323:Geochronology stubs
184:Franconia Formation
308:Cambrian Minnesota
230:Geowhen database.
151:Stratigraphic unit
141:Chronological unit
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190:in eastern
297:Categories
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164:Franconian
136:Definition
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192:Minnesota
188:Franconia
168:Cambrian
123:Regional
318:Paibian
95:↓
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180:Ma
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89:N
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69:T
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59:C
54:D
49:S
44:O
39:κ
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