three intrusive granitoid bodies from northwest saveh, central iran, are embedded in volcanic sedimentary rocks of the eocene,forming isolated small outcrops: khalkhab quartz monzodioritic units (sio2: ~52-57 wt %) to the northwest, neshveh granodioriticunits (sio2: ~62-71 wt %) to the northeast, and selijerd granodioritic units (sio2: ~63-69 wt %) to the southeast. the khalkhab unit iscomposed...

Track and cladistic biogeographic analyses based on insect taxa are used as a framework to interpret patterns of the Latin American and Caribbean entomofauna by identifying biogeographic areas on the basis of endemicity and arranging them hierarchically in a system of regions, subregions, dominions, and provinces. The Nearctic region, inhabited by Holarctic insect taxa, comprises five provinces...

Alpine vegetation is scarce in central Mexico (≈150 km2) and occurs on the 11 highest peaks of Trans-Mexican Volcanic Belt (TMVB). Timberline at (3700) 3900 m, 4750 m vascular plants cease to exist. The alpine flora comprises 237 species from 46 families 130 genera. Asteraceae (44), Poaceae (42), Caryophyllaceae (21) possess 45% species; none remaining have more than 10 species. Four are strict...

More than 50 conspicuous tephra beds occur in the Kanguk Formation of SW Banks Island. Their glass shards are remarkably well preserved and permit comprehensive characterization offering potential for reliable, precise correlation Upper Cretaceous sedimentary rocks across three major depocentres Arctic Archipelago adjacent northern continental margin: Sverdrup, Banks, Beaufort-MacKenzie basins....

the area is located 20 km northwest of kashmar and about 4 km of kalateh taimour in khorasan razavi province. the study area is part of tertiary volcanic-plutonic belt north of daruneh fault and its situation in tectonic inliers between two important active faults, doruneh and taknar. volcanic rocks are mainly intermediate to acid pyroclastic type. they formed during early tertiary. the volcani...