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Read or Download The ammonite family Hildoceratidae in the Lower Jurassic of Britain. part l et II. Monograph paleont. Soc., London PDF
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Additional info for The ammonite family Hildoceratidae in the Lower Jurassic of Britain. part l et II. Monograph paleont. Soc., London
Example text
So the dating o f the Raasay Iro n sto n e as Bifrons Zone, C om m une Subzone (=Subcarinatum Subzone o f Buckm an), stems entirely from Buckm an’s identification (in Lee, 1920, pp. 32, 66, 67) of one or m ore am m onites from the Raasay Ironstone of Raasay as “Hildoceras bifrons (d ’Orbigny, non B ruguiere)”. N one of the accompanying Dactylioceratidae are distinctive of that subzone, as all of them were given identifications that could be appli cable to Falciferum Zone species (few of Buckm an’s identifications are reliable: for example, some of the am m onites from both the top of the Scalpa Sandstone and the Portree Shales were identified as Dactylioceras cf.
This is often called “uncoiling o f the body-cham ber”, but in fact it rarely actually uncoils away from the previous whorl. Instead, the spirals o f bo th ven ter and um bilical seam d ep art from the spirals followed during im m ature growth, so that the umbilicus widens and the relative whorl height decreases. In some cases the actual whorl height may decrease over the last quarter whorl, and in species with depressed whorls, the real whorl breadth often decreases. 2. Modification of the ribs on the final part of the body-chamber, which becom e variously striate, coarser, or less strongly curved and angled.
491-92) refined, the lettered nom enclature that is always applied to individual layers in the bed. T he Ju n c tio n Bed occurs in two cliff developm ents: in the “W estern Cliffs” betw een Seatown and Eypesmouth it is up to lm thick, the layers are regularly deposited, and there are representatives o f m ost horizons from the Spinatum Zone up to the Levesquei Subzone. These are layers R to I, but no block of the bed contains all the layers, and there are some highly attenuated blocks that contain only two layers.