From: owner-ammf-digest@smoe.org (alt.music.moxy-fruvous digest) To: ammf-digest@smoe.org Subject: alt.music.moxy-fruvous digest V14 #4472 Reply-To: ammf@fruvous.com Sender: owner-ammf-digest@smoe.org Errors-To: owner-ammf-digest@smoe.org Precedence: bulk alt.music.moxy-fruvous digest Sunday, June 28 2020 Volume 14 : Number 4472 Today's Subjects: ----------------- Baam Baam Baam... ["**Blackoutusa" ] ---------------------------------------------------------------------- Date: Sun, 28 Jun 2020 10:07:52 -0400 From: "**Blackoutusa" Subject: Baam Baam Baam... Baam Baam Baam... http://perperon.today/CrAQlI3hZRcz9AtKJ0a-i3lrAHhU535Yax5CDEvaaH_CF3ky http://perperon.today/VhtrVikZR_TQw_yCifCJBkW1WZaiLILFpPDqO5miKujbJD4H adarrama is the result of a clash between tectonic plates belonging to the South sub-plateau and the North sub-plateau, both part of the Iberian Peninsula's larger Meseta Central (Central Plateau). The mountain range was formed during the Cenozoic era (starting 66 million years ago), although the predominant material of which the mountains are composed (granite shelf tableland) was preexisting, having been laid down during the Variscan orogeny during the Paleozoic era when the continental collision between Laurasia and Gondwana occurred to form Pangaea. The mountains have undergone significant erosion since their formation, which is the reason why many peaks, especially in the northern and southern sections, have flattened summits, called "cuerdas" by mountaineers. For these reasons, the material making up the Sierra de Guadarrama is of more ancient origin than many other well-known mountain systems, such as the Pyrenees, the Alps, the Andes and the Himalayas. Formation detail In the mid Paleozoic era (between 360 and 290 mya), an initial substratum of ancient granites and sediments started bending and metamorphizing, forming gneiss. Thereafter, approximately 290 and 250 mya during the Carboniferous period, the gneiss fractured, allowed a mass of magma to reach the surface which ultimately hardened into a granite shelf tableland. In the final phase of the Paleozoic era, during the Permian period, the tectonic plate collision causing the whole mountain range to rise. Finally, during the end of the Paleozoic through the Mesozoic era (between 250 and 65 mya) and up to the present, ongoing erosion processes reduced the size and smoothed and rounded the profile of the mountains of the Guadarramas. It was also during this geologic era that an ocean shift took place, causing the present-day location of the mountains to be part of the ocean for a time. It is possible that the then-peak formations were only small islands, barely rising above the level of the ocean. This accounts for the presence of limestone (a sedimentary rock formed predominately from calcite derived from marine organisms) found in the rims of Guadaramma mountain peaks and in some of their interior caves. Limestone formations are evident at a number of the peaks, notably El VellC3n, La Pinilla and Patones. Other processes were at play during the Cenozoic era that shaped the present form of the Guadarammas. The erosion of the rocky massif provoked sedimentation which filled the mountain basins with sandstone. The action of glaciers during the Quaternary Period (1.8 mya up to the present) shaped several mountain profiles with small cirques, carved glacial lakes and left behind moraines. All three features can be found on PeC1alara. Additionally, some traces of glacial passage are found in El Nevero and La Maliciosa in the form of sheepback-grooved rocks and small cirques. Finally, in the last million years, the action of glaciers caused consolidation of the network of rivers criss-crossing the mountain slopes, carved valleys and terraces result ------------------------------ End of alt.music.moxy-fruvous digest V14 #4472 **********************************************