Egy-két vékony venta Kolumbiában, Túrák Dél-Amerikába - utazás, kirándulások, pihenés. Latin-Amerika Latin-Amerika üdülőhelyek
The group, in older literature also defined as formation, is in its present-day type section in the Tatacoa Desert in the department of Huila subdivided into two main formations; La Victoria and Villavieja.
The group was originally defined in and named after HondaTolima, but has been redefined based on the many fossil finds in the Tatacoa Desert, kilometres mi to the south. In the original type section of its occurrence, the 3, metres 10, ft thick group is subdivided into three formations, from old to young; Cambrás, San Antonio and Los Limones.
The Honda Group is a Konzentrat-Lagerstätte at the fossiliferous La Venta site in the department of Huila and eastern Tolima and hosts one of the richest formations containing Miocene fauna worldwide. Etymology and definitions[ edit ] View of Honda, Tolima, namesake of the Honda Group The group was first defined by Hettner in in the area of the town after which it is named; HondaTolima.
Szállásod egy a buszpályaudvartól nem messze fekvő hostel lesz. A buszút kb. Megérkezvén elfoglalod a szállásod, s egy újabb busszal Mexikó leghíresebb romvárosába, Chichén Itzába utazol. Chichén Itzában látható a minden Mexikó könyv borítójáról visszaköszönő Kukulkán templom, a legnagyobb maja frízekkel borított labdajátéktér, a csillagvizsgáló, valamint az a cenote, amiből a régészek női áldozatok csontvázait emelték ki.
The first author who used the name Honda for a group, was American zoologist who studied the La Venta fauna in detail, Egy-két vékony venta Kolumbiában Arthur Stirton. Subdivisions of the group have been proposed by many different authors with high detail in egy-két vékony venta Kolumbiában different beds.
The valley in between the two major orogenic chains is filled by the Magdalena Riverthe longest river of Colombia. In Middle Miocene times, the geography was more comparable to the present eastern foothills of the Andes.
Discovery and naming[ edit ] The Tatacoa Desert, in which has been discovered numerous Miocene fossils, including to Langstonia.
The Western and Central Ranges were the first to be exhumed in the Paleogene, with minor uplifts in the Eastern Ranges at this age. The onset of the regional uplift of the Eastern Ranges is dated around the Middle Miocene, with an increased rate of exhumation between 12 and 3 Ma.
Previously, the La Dorada Formation has been named as a subdivision of the Honda Group, while other authors define that unit as a member. The type locality of the La Victoria Formation has been set in the La Venta area and the formation is named after the town of La Victoria, at 15 kilometres 9.
Túrák Latin-Amerikába: látnivalók
The conglomerate shows trough-cross lamination and imbrication of clasts in a predominantly matrix-supported sequence, with minor clast-supported sections.
The base of the conglomerate marks an erosional surface into the underlying silt and clay beds. The clasts of the conglomerate are mostly milky quartz, chert and volcanic in origin, with diameters averaging around 7 centimetres 2. Conglomeratic and medium to coarse-grained sandstone banks, with a similar grain composition as the conglomerates, up to 2 metres 79 in thick are intercalated between the conglomeratic sections.
Latin-Amerikában való utazás: egy csokor kultúra
The sandstones are cemented by calcium carbonate in hardgrounds that sometimes form rounded concretions. The claystones and siltstones that are less commonly found in the La Victoria Formations range in thickness from 1 to 11 metres 3.
Two years later, the author elevated the rank to a formation, as part of the Honda Group. The formation takes its name from the municipality VillaviejaHuila, 35 kilometres 22 mi to the north-northeast of the departmental capital Neiva. The remaining quarter is composed of conglomeratic sandstones. The thickness of the siltstones and claystones can exceed 8 metres 26 ft and have interspersed fine- to medium-grained 10 centimetres 3.
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The fine sediments of the Villavieja Formation are coloured greenish, reddish-brown or bluish-grey and display weathering patterns in so-called "cauliflower erosion" egy-két vékony venta Kolumbiában. The light grey coarser beds, up to conglomeratic sandstone size, do not exceed 2. The Baraya Member of the Villavieja Formation shows thin yellowish and reddish brown sandstone and siltstone levels with volcaniclastic grains.
Outcrops along the road between Girardot and Agua de Dios fogyjon jól, Cundinamarca show a lower sequence of thick beds of greenish-yellow feldspar - and mica -rich conglomeratic sandstones, intercalated with reddish claystones and an upper level of alternating medium-to-coarse grained quartz arenites with low-angle cross stratification.
These sandstones are intercalated with thick layers of fissile claystones with common calcareous sandstone concretions.
The total thickness of these formations in the northern original type section of the Honda Group reaches 3, metres 10, ft while a total thickness of 5, metres 16, ft has been registered. The paleocurrent was from the west to the east and east-southeast. Paleocurrent analysis of the sediments in the Baraya and Cerro Colorado Members has revealed a similar flow direction as the La Victoria paleorivers, while fogyás port saint lucie upper part of the Cerro Colorado Member shows an opposite trend to the west.
Today, these levels of rainfall are associated with the transition between savanna and forest environments in lowland South America. The vegetation of the La Venta fossil assemblage was diverse due to the different biomes of the depositional environment; meandering and braided river systems in a setting at lower altitudes than the present-day elevation of more than metres 1, ft above mean sea level.
It has been suggested that the vegetational cover of the Honda Group sedimentary sequence was not a continuous canopy forest, yet a complex pattern of different flora ecosystems.
The evergreen Amazonian foothill forests of today would therefore postdate the uplift of the Eastern Ranges of the Andes.
At the La Venta site, numerous fossils of various orders have been recovered and are found still.
Fogyni próbál, de kimerült site marks a unique ecosystem showing a broad range of biodiversity. La Venta is also an important site as it represents the youngest uniquely South American faunal assemblage before the Great American Biotic Interchange ; the result of the uplift of the Isthmus of Panamaof which the initial phase has been dated at around 12 Ma.
The Sparassodonta formed the dominant carnivorous mammal group in South America during most of the Cenozoic.
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In South America, the carnivorous adaptive zone in terrestrial ecosystems was shared with other mammals; terror birds Phorusrhacoidealarge crocodiles Sebecidaelarge snakes Madsoiidae and Boidaeand even occasionally frogs. The giant sloth Brievabradys laventensisthe primate Stirtonia tatacoensis originally described as Kondous laventicusand the marsupial Micoureus laventicus were named after La Venta, while the primates Miocallicebus villaviejai and Stirtonia victoriae received their species epithets from the formations comprising the Honda Group.
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