A factor analytic description of the phanerozoic marine fossil record

  title={A factor analytic description of the phanerozoic marine fossil record},
  author={J John . Sepkoski},
Data on numbers of marine families within 91 metazoan classes known from the Phanerozoic fossil record are analyzed. The distribution of the 2800 fossil families among the classes is very uneven, with most belonging to a small minority of classes. Similarly, the stratigraphic distribution of the classes is very uneven, with most first appearing early in the Paleozoic and with many of the smaller classes becoming extinct before the end of that era. However, despite this unevenness, a Q-mode… Expand
Phanerozoic marine faunas and the stability of the earth system
Abstract The marine fossil record of Phanerozoic Metazoa consists chiefly of samples of local faunas, often time-averaged and scattered sporadically in space and time. Ecological or evolutionaryExpand
Effects of sampling standardization on estimates of Phanerozoic marine diversification
  • J. Alroy, C. Marshall, +22 authors A. Webber
  • Biology, Medicine
  • Proceedings of the National Academy of Sciences of the United States of America
  • 2001
A new database of this kind for the Phanerozoic fossil record of marine invertebrates is introduced and four substantially distinct analytical methods that estimate taxonomic diversity by quantifying and correcting for variation through time in the number and nature of inventories are applied. Expand
Phanerozoic Marine Biodiversity: A Fresh Look at Data, Methods, Patterns and Processes
Patterns of Phanerozoic global biodiversity continue to be a major focus of palaeobiological research. Recent advances have been fuelled by the establishment of the Paleobiology Database. This newExpand
Diversification, Faunal Change, and Community Replacement during the Ordovician Radiations
The Ordovician evolutionary radiations represent a major pivotal point in the history of life on earth. During the few tens of million years between the ends of the Cambrian and Ordovician Periods,Expand
Increase in evenness and sampled alpha diversity through the Phanerozoic: Comparison of early Paleozoic and Cenozoic marine fossil assemblages
Trends in the relative abundance of taxa are examined and the results indicate that the evenness of fossil samples increased through the Phanerozoic, largely owing to a decrease in the Relative abundance of the most common taxa. Expand
Crustacean biodiversity through the marine fossil record
Ostracodes were the first major group to radiate, attaining high diversity during the Ordovician Period with other members of the Paleozoic evolutionary fauna; rates of extinction and responses to mass extinctions were also similar to those of groups within the paleozoic fauna. Expand
Memoir 4: An Analysis of the History of Marine Animal Diversity
A distinctive structure characterized the marine ecosystem during intervals of evolutionary radiation—one in which rates of diversification were exceptionally high and yet increases in diversity did not depress rates of diversity. Expand
A multiscale view of the Phanerozoic fossil record reveals the three major biotic transitions
This study supports the notion that both long-term ecological changes and major geological events have played crucial roles in shaping mega-assemblages that dominated Phanerozoic oceans, and suggests that the mid-Cretaceous radiation of the so-called Modern evolutionary Fauna triggered a biotic transition comparably to the transition following the largest extinction event in the Phanrozoic. Expand
Paleozoic Gastropoda
Gastropods have a rich fossil record stretching back to the Cambrian. However, determining the relationships of those early taxa to each other and (especially) to extant taxa entails majorExpand
A survey of palaeontological sampling biases in fishes based on the Phanerozoic record of Great Britain
Fishes represent more than half of all living vertebrate species, but patterns of fish diversity remain little explored in the fossil record. A compendium of fossil occurrences from Great Britain wasExpand


A kinetic model of Phanerozoic taxonomic diversity I. Analysis of marine orders
This model appears to describe adequately the “explosive” diversification of known metazoan orders across the Precambrian-Cambrian Boundary, suggesting that no special event, other than the initial appearance of Metazoa, is necessary to explain this phenomenon. Expand
The Permian-Triassic Boundary: A Crisis for Bivalves?
Abstract A conventional plot of the number of bivalve genera at different times throughout the Permian and Triassic results in a spindle diagram with a narrow waist in the earliest Triassic. Only 19Expand
Species diversity in the Phanerozoic; a tabulation
On the basis of about 70,000 species citations in the Zoological Record, it is esti- mated that about 190,000 fossil invertebrate species were described and named through 1970. The true figure may beExpand
Chapter 7 Trends, Rates, and Patterns of Evolution in the Bivalvia
This chapter presents insight into large-scale evolution through the study of a class of animals that is well represented both in the modern world and in the fossil record, the Heteroconchia, which includes the majority of post-Paleozoic burrowing clams. Expand
Early Phanerozoic annelid worms and their geological and biological significance
Examination of the Cambrian genus Volborthella shows that it resembles in significant characters tubes of sabellariid worms, and on this basis the morphology and ecology of the animal can be reconstructed. Expand
Species richness in marine benthic habitats through the Phanerozoic
The within-habitat data suggest that the number of marine invertebrate species in the world has increased since the Middle Paleozoic, but possibly only by about 4 times, not the order of magnitude or more suggested by Valentine (1970). Expand
Permo-Triassic extinction
  • F. Rhodes
  • Geology
  • Geological Society, London, Special Publications
  • 1967
The Permo-Triassic extinction of many fossil groups is one of the most striking events in the history of life: a ‘crisis in earth history’ which marked the end of an era. Major groups of organisms,Expand
The Echinoderms and Permian-Triassic Time
Abstract The Permian-Triassic boundary is not of special significance in the development of most of the echinoderms. Although the Paleozoic echinoids are very unlike those of the Mesozoic, theExpand
Phanerozoic Diversity Patterns: Tests for Randomness
Patterns of origination within taxa, and patterns of dominance diversity among taxa are examined to distinguish nonrandom from random components. Numbers of first appearances per stage are sporadicExpand
The Mesozoic marine revolution: evidence from snails, predators and grazers
The substantial increase of snail-shell sturdiness beginning in the Early Cretaceous has accompanied, and was perhaps in response to, the evolution of powerful, relatively small, shell-destroying predators such as teleosts, stomatopods, and decapod crustaceans. Expand