Comparing the Deep Sea Rock and Fossil Records of Coccolithophores and Planktic Foraminifera Graeme T. Lloyd1, Paul N. Pearson2, Jeremy R. Young1 and Andrew B. Smith1 1 Department of Palaeontology, Natural History Museum, London, UK 2 School of Earth & Ocean Sciences, Cardiff University, Cardiff, UK
Land-based rock and fossil records show strong correlation… N Maps Generic diversity
…but what about the deep sea?•Most microfossil groups are highly cosmopolitan…•…and massively abundant (1000s specimens per gram)•Many remarkably continuous sections (>10 million years)•Phylogenies often incorporate ancestors•The best record we have?:•How does the deep sea rock record change over time?•How does the deep sea fossil record change over time?•Are the deep sea rock and fossil records correlated?•How do the two major calcareous groups compare?
The database Coccoliths Planktic forams•35,416 species occurrences •19,349 species occurrences•16,197 samples •3,850 samples•205 sites •135 sites•4,329 names •2,462 names Geotectonic history
Summary•How does the deep sea rock record change over time? •Exponential rise (opening ocean basin)•How does the deep sea fossil record change over time? •Coccolith species ~linear rise •Coccolith genera ~rapid rise followed by slow fall •Forams: double sawtooth (K-T divides)•Are the deep sea rock and fossil records correlated? •Yes, strongly•How do the two major calcareous groups compare? •Forams seem to be less biased than coccos