History of Silurian

	Revision 4 . . October 11, 2001 3:21 pm by Don Kenney [Added Faunal Stages]
	Revision 3 . . (edit) April 15, 2001 5:00 am by TimShell

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Added: 4a5,16

The Silurian is usually broken into Lower and Upper subdivisions, however some workers do use a Lower/Middle?/Upper? breakdown. The Faunal stages from youngest to oldest are: ? (Upper-Pridoli) Cayugan (Upper- Ludlow) Ludfordian (Upper- Ludlow) Gorstian (Upper- Ludlow) Homerian/Lockportian? (Middle-Wenlock) Sheinwoodian/Tonawandan? (Middle-Wenlock) Telychian/Ontarian? (Lower-Llandovery) Aeronian/Alexandrian? (Lower-Llandovery) Rhuddanian/Alexandrian? (Lower-Llandovery)