Spinosa - pulchellus Zone: Difference between revisions
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'''Definition''': From first appearance of ''Rugia spinosa'' to immediately below first appearance of ''Trigonosemus pulchellus'' (Johansen & Surlyk, 1990). There is a local acme in brachiopod density just below the middle part of the zone (Johansen & Surlyk, 1990). | '''Definition''': From first appearance of ''Rugia spinosa'' to immediately below first appearance of ''Trigonosemus pulchellus'' (Johansen & Surlyk, 1990). There is a local acme in brachiopod density just below the middle part of the zone (Johansen & Surlyk, 1990). | ||
Latest revision as of 11:04, 30 September 2013
Definition: From first appearance of Rugia spinosa to immediately below first appearance of Trigonosemus pulchellus (Johansen & Surlyk, 1990). There is a local acme in brachiopod density just below the middle part of the zone (Johansen & Surlyk, 1990).
Biostratigraphical correlation: The zone spans the junction of the B. lanceolata and B. occidentalis zones of the standard biozonal scheme.
Lithostratigraphical correlation: The zone equates with the middle and higher parts of the Sidestrand Chalk Member, the Trimmingham Sponge Beds Member and the Little Marl Point Member (Johansen & Surlyk, 1990).