Ptychagnostus

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1	Paleozoic Time Scale and Sea-Level History Time ScaLe R Creator ICS Add to Reading List Source URL: engineering.purdue.edu Language: English - Date: 2010-05-18 22:29:19 Ordovician Historical geology Agnostida Ptychagnostus Stratigraphy Trilobite zone Silurian Monograptus Cambrian Paleozoic Phanerozoic Trilobites
2	Paleozoic Time Scale and Sea-Level History Time ScaLe R Creator ICS Add to Reading List Source URL: engineering.purdue.edu Language: English - Date: 2010-05-18 22:28:55 Carboniferous Geochronology Permian Trilobites Asselian Ptychagnostus Sakmarian Trilobite zone Moscovian Paleozoic Phanerozoic Geologic time scale
3	NORWEGIAN JOURNAL OF GEOLOGY The Caledonides of the Oslo Region, Norway – stratigraphy and structural elements Add to Reading List Source URL: www.geologi.no Language: English - Date: 2013-10-30 09:21:04 Trilobites Ordovician Ptychagnostus Cambrian Silurian Baltic Shield Europe Phyla Protostome
4	Correlation between the base of Drumian Stage and the base of middle Caesaraugustan Stage in the Iberian Chains (NE Spain) Add to Reading List Source URL: www.geology.cz Language: English - Date: 2013-01-05 14:27:56 Taxonomy Agnostida Ptychagnostus Trilobite Cambrian Ordovician Geology of the Iberian Peninsula Phyla Protostome Trilobites