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New experimental information is presented about the effect of a nucleus on patrons which have undergone a hard scatter. We have observed clear dijet events from 400 GeV/c p-nucleus interactions and compared them to dijets from pp interactions. Our results show that the angular width of the individual jets is only slightly affected by the presence of the nucleus, but the acoplanarity of the jet pairs is sharply increased.

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Benthic foraminifers from Holes 522, 523, and 524 of DSDP Leg 73 (eastern South Atlantic) were quantitatively analyzed by using three methods: analysis of local originations and extinctions, factor analysis of species relative abundances, and population structure analyses of species diversity and equitability. The results of all three forms of analysis are compatible and show a sharp faunal change in the late Eocene. This change involves an almost complete cessation of local originations, a small increase in local extinctions, a dramatic shift in species relative abundances, and a sharp increase in species equitability. Sporadic small-scale variations in the same parameters during the middle Eocene precede the major change. These results indicate initiation of the psychrosphere in the latest Eocene, with precursor events in the middle Eocene. The faunal evidence is consistent with a northeast Atlantic source for the cold bottom water.

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