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(^94) H. A. ARMSTRONG & A. W. OWEN Fig. 8. Plots of maximum recorded generic diversity for Laurentia (a. b). Avalonia (c, d) ...
EUCONODONT DIVERSITY CHANGES 95 Fig. 9. Palaeolatitudes for East Avalonia (based on MacNiocail 2000). These data indicate a clos ...
96 H. A. ARMSTRONG & A. W. OWEN hence reconstructing biofacies architectures without recourse to extensive recollecting. Upp ...
EUCONODONT DIVERSITY CHANGES^97 BERGSTROM, S. M. 1990. Biostratigraphie and bio- geographic significance of Middle and Upper Ord ...
98 H. A. ARMSTRONG & A. W. OWEN OWEN. A. W., BRUTON. D. L.. BOCKELIE, J. F. & BOCK- ELIE. T. G. 1990. The Ordovician suc ...
The role of pyroclastic volcanism in Ordovician diversification JOSEPH P. BOTTING Department of Earth Sciences, University of Ca ...
100 JOSEPH P. BOTTING some extent, origination of novel life-habits provides additional subsidiary niches, most obviously in the ...
VOLCANISM AND DIVERSIFICATION 101 Fig. 1. Summary of ecological responses of plankton and benthos to volcanic ash deposition in ...
102 JOSEPH P. BOTTING Fig. 2. Idealized distribution of oxygenation effects around ash-fall deposits in a shelf region with immo ...
VOLCANISM AND DIVERSIFICATION 103 organic rain allowed a benthic bloom of sessile suspension-feeders to develop until oxygenatio ...
104 JOSEPH P. BOTTING (Whitlock & MeCauley 1990; McCauley 1991). Among the most critical parameters controlling genetic vari ...
VOLCANISM AND DIVERSIFICATION 105 with diversification centres on a regional to basin scale. If the proposed process was signifi ...
Fig. 4. Beyrichioeope ostracode range chart lor the pre-Ashgill of SW Wales, correlated with volcanic activity (local volcanic c ...
Fig. 5. (Ostracode range chart for the prc-Ashgill of Mid-Wales (Powys) and Shropshire. See Figure 4 for explanation ...
108 JOSEPH P. BOTTING (Lockley & Antia 1980; Gabbott 1999; Botting & Thomas 1999). For example, A. micula benthie popula ...
VOLCANISM AND DIVERSIFICATION 109 Fig. 6. Ostracode range chart for North Wales and northern England. See Figure 4 for explanati ...
Fig. 7. Pre-Caradoc range chart for Mid-Wales (Powys) and Shropshire Inarticulate' hrachiopods, based on data from Sutton et al. ...
VOLCANISM AND DIVERSIFICATION 111 number of sites. If the patterns observed for ostracodes reflect sampling bias resulting from ...
112 JOSEPH P. BOTTING BOTTJER, D. I, DROSER, M. L. & JABLONSKI, D. 1988. Palaeonenvironmental trends in the history of trace ...
VOLCANISM AND DIVERSIFICATION 113 LOCKLEY, M. G. & ANTIA, D. D. J. 1980. Anomalous occurrence of the Lower Palaeozoic brachi ...
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