Reef and temperate carbonate units alternate in the upper Miocene^Pliocene stratigraphic record of Betic basins palaeogeographically connected to the Mediterranean. Shallow-water coralline algal assemblages in temperate units differ in taxonomic composition from those in reef carbonate units. The difference attains the subfamily level since the temperate lithofacies are characterised by assembl...

Introduction: The geology of Terby Crater (28S, 287W), located on the northern rim of Hellas impact basin on Mars, is documented through geomorphic and stratigraphic analyses using all currently released visible and thermal infrared image data and topographic information. This large (D=164km), Noachian-aged [1] crater has a suite of geomorphic units [2] and landforms including massive troughs a...

As part of a 3.year program of geologic mapping from the Yukon border south through the Midway, Cassiar and Erickson mining camps (Nelson and Bradford, 1987a; 1987b; 1989, this volume; Nelson et al. 1988a; 1988b), I:25 000.scale mapping was conducted in the northeast quarter of the Needlepoint Mountain (104P/4) map area during the 1988 field season (Figure l-35-1). Since Gabrielse’s ( 1963) ori...

Introduction Geology involves measurement, calculation and modeling. Everyone would agree that these are mathematical activities. Geology also involves classification. “In geology we tend to classify everything” (Thomas and Thomas, 2000, p. 571). This observation is certainly borne out by the GeoRef database. On 29 June, 2001, a search under the keyword “classification” brought up 60 papers wit...

The Skeena Arch project was initiated in the 2000 field season as a follow up to work completed as part of the Nechako NATMAP project (MacIntyre and Struik, 1999). The main objective of this project is to define areas that have a high potent ia l for the discovery of volcanogenic massive sulphide and/or subaqueous hot spring deposits (Eskay Creek type) along the trend of the Skeena Arch, in cen...

In Africa and western Eurasia, occurrences of burials and utilized ocher fragments during the late Middle and early Late Pleistocene are often considered evidence for the emergence of symbolically-mediated behavior. Perhaps less controversial for the study of human cognitive evolution are finds of marine shell beads and complex designs on organic and mineral artifacts in early modern human (EMH...

Ross A. Beyer, NASA Ames Research Center, MS 245-3, Moffett Field, CA, USA ([email protected]) Ganges Mensa is a large mesa-like structure located near 311 E, 7.5 S on Mars within the Ganges Chasma. The slopes and surfaces of Ganges Mensa display a variety of morphologies, indicating that units of variable lithology constitute the stratigraphic stack of the mensa as observed by many previous ...

The congruence between the order of cladistic branching and the first appearance dates of fossil lineages can be quantified using a variety of indices. Good matching is a prerequisite for the accurate time calibration of trees, while the distribution of congruence indices across large samples of cladograms has underpinned claims about temporal and taxonomic patterns of completeness in the fossi...

We present a detailed description of the tectono-stratigraphic architecture eclogite-facies Internal Piedmont Zone (IPZ) metaophiolite, exposed in Lanzo Valleys (Western Alps), which represents remnant Jurassic Alpine Tethys. Seafloor spreading and mantle exhumation processes related to Tethys evolution strongly conditioned intra-oceanic depositional setting, resulted an articulated physiograph...

Several northeast-trending transverse faults cut the Purcell succession and parts of the Lower Paleozoic succession in the Hughes Range. Relationships along unconfonnities within and at the base of the Lower Paleozoic strata provide evidence of the natilre and timing of displacement on these faults. Field mapping of the faults and unconformities hounding three Lower Paleozoic formntions have be...