Various palaeoecological trends have been identified in the Phanerozoic, each focusing on different aspects of the fossil record. Patterns that have been described include histories of tiering, palaeocommunity species richness, and guild occupation in evolutionary faunas, as well as onshore-offshore trends in origination, expansion and retreat. Patterns of change through time have also been documented from biosedimentological features (ichnofabrics, microbial structures, shell beds). Such trends can be compared and contrasted to yield unique insights into understanding the changing ecology of the past, and in particular may be helpful in evaluating the relative degree of ecological degradation caused by a mass extinction. This comparative approach can also shed light on a variety of fundamental palaeobiological problems, for example, why no new body plans (phyla) have evolved since the early Phanerozoic. Causes of this phenomenon are thought to be either: (1) ecospace was not sufficiently open after the early Phanerozoic for survival of new body plans; or (2) accumulating developmental constraints after the early Phanerozoic have prevented the evolution of new body plans. Because the Permian-Triassic mass extinction was the most devastating biotic crisis of the Phanerozoic, one might expect new body plans to appear if ecospace were the primary limiting factor and opened sufficiently by this mass extinction. Although previous studies have shown that ecospace availability in the Cambrian and Early Triassic was indeed different, this comparative approach indicates that ecological conditions in the Early Triassic were most like those of the Late Cambrian/Early Ordovician. Thus, if ecospace availability has constrained the survival of new body plans, then ecospace has always been sufficiently filled after the Cambrian explosion to inhibit their evolution.

Статьи сборника освещают ряд проблем, отражающих разнообразие палеонтологических исследований на современном этапе: причины кризисов и массовых вымираний организмов, изменения отдельных групп на конкретных рубежах, этапы развития в мезозое и кайнозое кишечнополостных и брахиопод, изменение растительности 'на рубежах апта и альба на Северном Кавказе, а также олигоцена и миоцена в Северной Якутии, этапы развития диатомовой флоры Северо-Востока СССР в кайнозое, биотические собы-бия в развитии живетско-франкской флоры Центрального Казахстана.

Для палеонтологов, стратиграфов, биологов.

В книге рассмотрены основные вопросы теоретической геологии, пока окончательно не решенные. Это происхождение и становление планеты Земля, природа первичной коры, происхождение континентальной коры и жизни на Земле, причины великих вымираний, внутренние и внешние источники энергии геологических процессов, взаимосвязь глубинных и поверхностных процессов, общая направленность эволюции Земли, механизмы движений и деформаций земной коры и литосферы, характер геологических процессов, роль космических факторов в этих процессах.

Для широкого круга читателей, интересующихся общими проблемами естествознания, и специалистов-геологов.

In the book main yet unsolved problems of theoretical geology are considered, beginning by the origin of our Earth, continuing by the appearance of its first crust, formation of the continents, origin of life on the Earth, great extinctions and renovations of the organic world, advent of plate tectonics, causes of the great ice ages, character of the course of geological processes, existence of a general trend in the evolution of geological processes on Earth, origin of the regmatic net and ring structures and ending by mechanism of endogenic processes, possible cosmic influence, expansion or contraction of the Earth. A conclusion about the uniqueness of the planet Earffris deduced and features of this uniqueness are noted.