New fossil fresh-water mollusks from Ecuador

Abstract

yield three new genera, each represented bj'^one new species, and a new species of Pomacea. They were collected by Doctor Sheppard in the vicinity of the towns of Biblian and Paccha, Ecuador. Until recently both these towns were in the Province of Canar, in southern Ecuador. A recent change in provincial boundaries leaves Biblian in Canar but places Paccha in the adjoining province, Azuay. The junior author has supplied the following data referring to the two localities, which lie on the watershed between the Atlantic and the Pacific : Biblian lies a few miles northeast of the provincial capital, Azogues, and a little southeast of the city of Canar. It is located on the northwest bank of a small river, tributary of the Rio Paute, the waters of which, by way of the Rio Santiago and the Rio Maranon, reach the Amazon in western Brazil. About 7 or 8 miles north, and coming from some distance east, is a tributary of the Rio Canar, which flows into the Rio Naranjal of the Pacific drainage. Between the Naranjal and the Paute is a range of mountains, approximatel}1 2,140 feet in altitude. Azogues, but a mile or two downstream from Biblian, has an altitude of about 8,200 feet, indicating a rapidly descending river, probably with high banks. Paccha, now in the Province of Azuay, is a much smaller town, considerably south of Biblian and lying between the Rio Paute and a tributarj^, the Rio Quingeo. It is situated in a high valley, surrounded by hills, except on the side toward the Rio Paute, which here flows in an east-northeast direction. Southwest, toward the Rio Quingeo, is a high pass, but most of the surrounding country is less than 10,830 feet in altitude. Cuenca, on the Rio Matadero, a western

The stratigraphical paleontology of the Tertiary non-marine sediments of Ecuador

“…Flora, fauna, and age. -Until recently the fauna of the Cuenca Basin was thought to be endemic (Marshall and Bowles, 1932;Liddle and Palmer, 1941). Parodiz (1969) first demonstrated that certain species did occur outside Ecuador.…”

“…section; Loyola Formation rests on lava radiometrically dated at 19 and 20 million years ago sandstone and conglomerates" locality of Marshall and Bowles (1932); loc. 1038 of Liddle and Palmer (1941) Nabon Basin Nabon is a village about 50 km south of Cuenca and 75 km north-northeast of Loja.…”

“…Genus Potamolithoides Marshall and Bowles, 1932 Type. -Potamolithoides biblianus Marshall and Bowles, 1932:4, figs.…”

“…Subfamily Potadominae ( = Melanatriinae) Genus Doryssa H. and H. Adams, 1854 Sheppardiconcha Marshall andBowles, 1932. Type species. -Melania atra (Bruguiere, 1792).…”

Metamorphic Rocks of the Eastern Andes near Cuenca, Ecuador

“…made by the present writers from the same beds and localities was submitted to Dr. W. B. Marshall, of the United States National Museum, who reports that it consists largely of new genera and species, and that the age cannot be later than the Pliocene, and it may be earlier (2). These beds are thrown generally into a series of relatively gentle folds, having a north-south trend, but occasionally they are found in a more highly disturbed condition as, for example, on the Biblian-Azogues road, where they are sometimes seen to be vertical.…”