Martin G. Lockley

Bio: Martin G. Lockley is an academic researcher from University of Colorado Denver. The author has contributed to research in topics: Trackway & Cretaceous. The author has an hindex of 47, co-authored 371 publications receiving 9260 citations. Previous affiliations of Martin G. Lockley include University of Arizona & University of Colorado Boulder.

Dinosaur Tracks and Other Fossil Footprints of the Western United States

Abstract: For dinosaur lovers and tourists alike, this guide explores the palaeontological treasure trove of the western United States. Concentrating on the rich fossil life of the Colorado Plateau region - including parts of Utah, Arizona, and New Mexico - it gives readers the story behind a track record which extends some 300 million years back in time. Readers learn about America's prehistory as they explore a region with one of the best track records of land animals found anywhere in the world. An appendix lists museums and other major repositories of tracks and replicas, and gives details on tracksites open to the public. Lockley leads his readers to the footprints themselves, and shows fossil explorers how these traces can help to interpret the behaviour of dinosaurs.

Tracking Dinosaurs: A New Look at an Ancient World

Abstract: Preface 1. Track facts: what, where, and when 2. The meaning of tracks 3. Understanding track preservation 4. Discovery and documentation 5. Classification: a field guide to dinosaur tracks 6. Individual behaviour 7. Social behaviour 8. Ancient ecology 9. Evolution 10. Dinosaur tracks and ancient environments 11. Trampled underfoot 12. Megatracksites: a new era in tracking 13. Myths and misconceptions 14. The dinosaur trackers 15. Epilogue: Trail to the twenty-first century Appendix A. Where to visit dinosaur tracksites Appendix B. Glossary Notes Index.

Dinosaur tracks and traces

Abstract: Part I. Introduction Part II. Historical Perspectives Part III. Locomotion and Behaviour Part IV. Eggs and Nests Part V. Paleoecological, Paleoenvironmental and Regional Synthesis Part VI. Biostratigraphy Part VII. Experimentation and Functional Morphology Part VII. Site Reports Part IX. Systematic Ichnology Part X. Conservation and Preservation.

American Association of Petroleum Geologists

Abstract: Norman H. Foster Outstanding Explorer Award The Outstanding Explorer Award is given in recognition of distinguished and outstanding achievement in exploration for petroleum or mineral resources. William A. Zagorski Robert R. Berg Outstanding Research Award The Robert R. Berg Outstanding Research Award is presented in recognition of a singular achievement in petroleum geoscience research and named in honor of a man who himself contributed greatly to the science of petroleum geology. Ronald A. Nelson J. Frederick Sarg

New perspectives on morphological variation in tridactyl footprints: clues to widespread convergence in developmental dynamics

Abstract: It is well-known that the phalangeal formulae of the feet of dinosaurs and other vertebrates are relatively consistent within any given clade. Indeed, such similarities are part of the basis for alpha taxonomy (e.g., bird and non-avian theropod relationships). Developmental studies of the vertebrate foot support the view that morphological similarity owes as much to intrinsic (formal) developmental dynamics as to extrinsic (functional) influences. Thus, the morphologies of ornithopod, non-avian theropod and most bird feet are convergent (especially with respect to digits II-IV) despite significant differences in size and functional adaptation. Despite these "general" convergences, "detailed" variation in the morphology of tridactyl, mesaxonic, Triassic through recent non-avian dinosaur and bird tracks has allowed the diagnosis of hundreds of ichnotaxa, as well as the recognition of nearly continuous subtle variation in modern bird tracks. Several studies characterize this variation by measuring how far digit III projects anteriorly beyond lateral digit IV and medial digit II, creating an "anterior triangle" between the tips of digits II, III and IV (Weems, 1992). Differences in this projection of digit III highlight a polarity between strong mesaxony (strong central tendency) and weak mesaxony (weak central tendency). Early studies (Olsen, 1980) suggested that as theropod tracks in the Grallator-Eubrontes plexus increase in size, they shift from narrow to wide and from strongly to weakly mesaxonic. However, such polarities also reiterate (independent of size) among medium-sized and diminutive theropod tracks (e.g., Minisauripus). Such polarity also recurs among ornithopods, and is equally striking in extant birds (e.g., between passerines and members of the charadriiformes). Such "intrinsic" differences can only be partially attributed to functional variation in digit divarication caused by foot-substrate interaction. Moreover, such polarities in foot morphology give important clues to whole limb and whole body proportions, and suggest an intrinsic "lawfulness" to patterns of convergence.

A new species

Abstract: We redescribe the only previously known species of Myrsidea from bulbuls, M. pycnonoti Eichler. Sixteen new species are described; they and their type hosts are: M. phillipsi ex Pycnonotus goiavier goiavier (Scopoli), M. gieferi ex P. goiavier suluensis Mearns, M. kulpai ex P. flavescens Blyth, M. finlaysoni ex P. finlaysoni Strickland, M. kathleenae ex P. cafer (L.), M. warwicki ex Ixos philippinus (J. R. Forster), M. mcclurei ex Microscelis amaurotis (Temminck), M. zeylanici ex P. zeylanicus (Gmelin), M. plumosi ex P. plumosus Blyth, M. eutiloti ex P. eutilotus (Jardine and Selby), M. adamsae ex P. urostictus (Salvadori), M. ochracei ex Criniger ochraceus F. Moore, M. borbonici ex Hypsipetes borbonicus (J. R. Forster), M. johnsoni ex P. atriceps (Temminck), M. palmai ex C. ochraceus, and M. claytoni ex P. eutilotus. A key is provided for the identification of these 17 species.

Large igneous provinces: crustal structure, dimensions, and external consequences

Abstract: Large igneous provinces (LIPs) are a continuum of voluminous iron and magnesium rich rock emplacements which include continental flood basalts and associated intrusive rocks, volcanic passive margins, oceanic plateaus, submarine ridges, seamount groups, and ocean basin flood basalts Such provinces do not originate at “normal” seafloor spreading centers We compile all known in situ LIPs younger than 250 Ma and analyze dimensions, crustal structures, ages, and emplacement rates of representatives of the three major LIP categories: Ontong Java and Kerguelen-Broken Ridge oceanic plateaus, North Atlantic volcanic passive margins, and Deccan and Columbia River continental flood basalts Crustal thicknesses range from 20 to 40 km, and the lower crust is characterized by high (70-76 km s?1) compressional wave velocities Volumes and emplacement rates derived for the two giant oceanic plateaus, Ontong Java and Kerguelen, reveal short-lived pulses of increased global production; Ontong Java’s rate of emplacement may have exceeded the contemporaneous global production rate of the entire mid-ocean ridge system The major part of the North Atlantic volcanic province lies offshore and demonstrates that volcanic passive margins belong in the global LIP inventory Deep crustal intrusive companions to continental flood volcanism represent volumetrically significant contributions to the crust We envision a complex mantle circulation which must account for a variety of LIP sizes, the largest originating in the lower mantle and smaller ones developing in the upper mantle This circulation coexists with convection associated with plate tectonics, a complicated thermal structure, and at least four distinct geochemical/isotopic reservoirs LIPs episodically alter ocean basin, continental margin, and continental geometries and affect the chemistry and physics of the oceans and atmosphere with enormous potential environmental impact Despite the importance of LIPs in studies of mantle dynamics and global environment, scarce age and deep crustal data necessitate intensified efforts in seismic imaging and scientific drilling in a range of such features

Iceberg discharges into the north atlantic on millennial time scales during the last glaciation.

Abstract: High-resolution studies of North Atlantic deep sea cores demonstrate that prominent increases in iceberg calving recurred at intervals of 2000 to 3000 years, much more frequently than the 7000-to 10,000-year pacing of massive ice discharges associated with Heinrich events. The calving cycles correlate with warm-cold oscillations, called Dansgaard-Oeschger events, in Greenland ice cores. Each cycle records synchronous discharges of ice from different sources, and the cycles are decoupled from sea-surface temperatures. These findings point to a mechanism operating within the atmosphere that caused rapid oscillations in air temperatures above Greenland and in calving from more than one ice sheet.

The evolution of dinosaurs

Abstract: The ascendancy of dinosaurs on land near the close of the Triassic now appears to have been as accidental and opportunistic as their demise and replacement by therian mammals at the end of the Cretaceous. The dinosaurian radiation, launched by 1-meter-long bipeds, was slower in tempo and more restricted in adaptive scope than that of therian mammals. A notable exception was the evolution of birds from small-bodied predatory dinosaurs, which involved a dramatic decrease in body size. Recurring phylogenetic trends among dinosaurs include, to the contrary, increase in body size. There is no evidence for co-evolution between predators and prey or between herbivores and flowering plants. As the major land masses drifted apart, dinosaurian biogeography was molded more by regional extinction and intercontinental dispersal than by the breakup sequence of Pangaea.