Abstract
Abstract. The town of La Paz is situated between the Bolivian Highland (Altiplano) and the Central Mountain Range. These two landscape units were mostly formed during the Tertiary. But at their intermediate bordering zone, geomorphological forms have 'later been reshaped. At the end of the Pliocene, a peneplain was formed (the Altiplano of today) and got covered by volcanic ashes. Since the fossilization of mammals (Posnanskytherium) in the late Pliocene, a tektonical uplift of about 3300 ft. has taken place, and huge moraines built up covering the whole city area of today. The enormous La Paz Valley was eroded above all during the last interglacial period. During the last ice age, the glaciers reached the present upper city border only and melted away very rapidly 9800 years ago at the latest.
Highlights
Sie haben in katastrophaler Art ge¬ zeigt, wie aktiv auch heute noch die geomorpho¬ logischen Prozesse im Talkessel von La Paz sind
The town of La Paz is situated between the Bo-Paz (Bolivien) und die Diluvialgeschichte livian Highland (Altiplano) and the Central
These two landscape units were mostly formed during the Tertiary
Summary
Die Stadt La Paz erstreckt sich in einer -3 6 km breiten Schlucht am nordöstlichen Rand des boli¬ vianischen Altiplano. Sie wächst teilweise auf diese Hochebene hinauf und nimmt damit Höhenla¬. Aufschlüsse von Lockermaterial sind im ganzen Stadtgebiet und in den Tälern der Umgebung häu¬. Fels tritt dagegen nur ausserhalb der Stadt zutage, und zwar sind es vorwiegend paläozoische Schiefer und rote, kretazische Sandsteine (AHL¬ FELD 1972, S.92). Wie mächtig die darauf abge¬ lagerten Sedimente in La Paz sind, ist noch nicht mit Bohrungen ermittelt worden. Es kann aber aus der grossen Tiefe der Schlucht geschlossen wer¬ den, dass ursprünglich überall mindestens 500 m Schotter und Moränen angehäuft gewesen sind. Rial und die entsprechenden Oberflächenformen zu datieren und so die Abfolge ihrer Formungspro¬ zesse herzuleiten
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