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) – At sea: Santa Cruz to Port Famine, Gregory Bay (Bahía Gregorio, Chile) 52º39' S 70º14' W Day 885 – Fri – 30 May 1834 – (Sea) – At sea: Santa Cruz to Port Famine (Puerto Hambre, Chile) Day 886 – Sat – 31 May 1834 – (Sea) – At sea: Santa Cruz to Port Famine (Puerto Hambre, Chile) 1834 Port Famin
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sea: Straits of Magellan (Straits of Magellan, Chile) 52º30' S 69º35' W Day 762 – Mon – 27 Jan 1834 – (Sea) – At sea: Straits of Magellan Day 763 – Tue – 28 Jan 1834 – (Sea) – At sea: Straits of Magellan Day 764 – Wed – 29 Jan 1834 – (Sea) – At sea: Straits of Magellan, St Gregory Bay (Bahía Gregorio, Chile) 52º39' S 70º14' W Day 765 – Thu – 30 Jan 1834 – (Sea) – At sea: Straits of Magellan, Elizabeth island (Elizabeth Island, Chile) 52º53' S 70º44' W Day 766 – Fri – 31 Jan 1834 – (Sea) – At sea
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– (Land) – Rio de Janeiro (Rio de Janeiro, Brazil) 22º58' S 43º10' W Day 135 – Thu – 10 May 1832 – (Land) – Rio de Janeiro [Beagle to Bahia] (Rio de Janeiro, Brazil) 22º58' S 43º10' W Day 136 – Fri – 11 May 1832 – (Land) – Rio de Janeiro (Rio de Janeiro, Brazil) 22º58' S 43º10' W Day 137 – Sat – 12 May 1832 – (Land) – Rio de Janeiro (Rio de Janeiro, Brazil) 22º58' S 43º10' W Day 138 – Sun – 13 May 1832 – (Land) – Rio de Janeiro (Rio de Janeiro, Brazil) 22º58' S 43º10' W Day 139 – Mon – 14 May 1832
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Day 1358 – Tue – 15 Sep 1835 – (Sea) – At sea: Chatham Island (San Cristobal Island) 00º56' S 89º29' W Day 1359 – Wed – 16 Sep 1835 – (Harbour) – Chatham Island (Cerro Tijeretas, Chatham (San Christobal) Island, Ecuador) 00º53' S 89º36' W Day 1360 – Thu – 17 Sep 1835 – (Harbour) – Chatham Island, St Stephens Harbor (Puerto Grande, San Cristobal Island, Ecuador) 00º45' S 89º27' W Day 1361 – Fri – 18 Sep 1835 – (Harbour) – Chatham Island, Terrapin Road (Bahia Tortuga, San Cristobal Island
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A194
Periodical contribution:
Darwin in Argentina. Revista de la Asociación Geológica Argentina 64, no. 1 (February 2009): 1-180.
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Pérez, D.E. 2004. Oceanografía Física del estuario de Bahía Blanca. In Piccolo, M.C. and Hoffmeyer, M. (eds.) El Ecosistema del Estuario de Bahía Blanca. Instituto Argentino de Oceanografía, 61-67, Bahía Blanca. 36. Quattrocchio, M.E. and Borromei, A.M. 1998. Paleovegetational and paleoclimatic changes during the Late Quaternary in southwestern Buenos Aires province and southern Tierra del Fuego (Argentina). Palynology 22: 67-82. 37. Quattrocchio, M.E., Borromei, A.M. and Grill, S.C. 1995. Cambios
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A194
Periodical contribution:
Darwin in Argentina. Revista de la Asociación Geológica Argentina 64, no. 1 (February 2009): 1-180.
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. Bahía Thetis Formation The dominant slaty mudstones and sandstones cropping out in the Thetis Bay area were first recognized by Furque and Camacho (1949). Olivero et.al (2003) studied the Bahía Thetis Formation and recognized three packages, more than 250 m thick, of hard, highly deformed rocks including: 1) dark, organic-rich, laminated mudstones and tuffs with incipient cleavage; 2) resedimented conglomerates and pebbly mudstones; and 3) turbidite sandstones and slaty mudstones. The lowest organic
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A194
Periodical contribution:
Darwin in Argentina. Revista de la Asociación Geológica Argentina 64, no. 1 (February 2009): 1-180.
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formations of the Pampas in the footsteps of Darwin: south of the Salado Zárate, Marcelo; Folguera, Alicia Geology of the area of Bahía Blanca, Darwin's view and the present knowledge: a story of 10 million years Quattrocchio, Mirta E.; Deschamps, Cecilia M.; Zavala, Carlos A.; Grill, Silvia C.; Borrome, Ana M. The fossil mammals collected by Charles Darwin in South America during his travels on board the HMS Beagle Fernicola, Juan Carlos; Vizcaíno, Sergio F.; De Iuliis, Gerardo Young Darwin and the
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A194
Periodical contribution:
Darwin in Argentina. Revista de la Asociación Geológica Argentina 64, no. 1 (February 2009): 1-180.
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August and October 1832 and gave him the opportunity to visit Punta Alta near the fort of Bahía Blanca (Fig. 1). The second one was between November 1832 and May 1833 to visit the Beagle Channel, the surrounding areas of Tierra del Fuego Island, and the Malvinas Islands. The third and more important fieldtrip was, after landing in Carmen de Patagones in August 1833 (Fig. 1), to ride across the Pampas to Buenos Aires city and later on to Santa Fé and Bajada (today Paraná city) on the Río Paraná
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A194
Periodical contribution:
Darwin in Argentina. Revista de la Asociación Geológica Argentina 64, no. 1 (February 2009): 1-180.
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). In early August of 1833, Darwin disembarked from the Beagle at Patagones, a town by the Rio Negro, in northern Patagonia and began his journey heading north towards Bahía Blanca. From there he travelled across the southern Pampas to the Rio Salado area and Buenos Aires, continuing later to Santa Fe. Logistics for the trip was provided by Juan Manuel de Rosas - the Argentine administrator at the time - in the form of a passport to travel, horses, and a group of soldiers and gauchos to escort him
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A194
Periodical contribution:
Darwin in Argentina. Revista de la Asociación Geológica Argentina 64, no. 1 (February 2009): 1-180.
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Cruz and in the San Julián area. In contrast, outcrops with similar rocks in the Puerto Deseado area received far less attention (Frenguelli 1931, Feruglio 1949, del Río 2004, Giacosa et al. 1998). In this area, the Neogene marine rocks overlie Jurassic volcanic rocks of the Bahía Laura Group, and are reduced to patchy thin exposures isolated one another. Giacosa et al. (1998) used the informal name Patagoniano to designate these outcrops and suggested that these were equivalent to the San
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A194
Periodical contribution:
Darwin in Argentina. Revista de la Asociación Geológica Argentina 64, no. 1 (February 2009): 1-180.
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comprises the volcanic rocks of the Chon Aike Formation, which in this sector represents the easternmost exposures of the Deseado Massif. Darwin described these volcanics as trachytic porphyries. The unit includes the tectonic silicified breccias assigned to the Bahía Laura Group, and exposed at Cabo Blanco. These were erroneously interpreted by Darwin as siliceous sedimentary rocks and compared them to those of the Malvinas Islands. Off-limits he describes purple to pink, and sometimes laminated
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A194
Periodical contribution:
Darwin in Argentina. Revista de la Asociación Geológica Argentina 64, no. 1 (February 2009): 1-180.
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, the specimen assigned by Owen (1839b) to Scelidotherium was collected by Darwin in Punta Alta in August, 1833, the time during which Darwin had returned to this locality (Keynes 2001, p. 178). Further confirmation of this date appears in a letter from Darwin (1985, Letter 188), dated September 20, 1833, to Caroline S. Darwin, in which he recounts that I likewise at Bahia Blanca found some more bones more perfect than those I formerly found, indeed one is nearly an entire skeleton . As indicated
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A194
Periodical contribution:
Darwin in Argentina. Revista de la Asociación Geológica Argentina 64, no. 1 (February 2009): 1-180.
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Clapperton 1993). CHARLES DARWIN AND THE DISCOVERY OF THE RODADOS PATAGÓNICOS The voyage of the HMS Beagle took place between 1831 and 1836. The first opportunity in which Charles Darwin identified gravel deposits that are today known as Rodados Patagónicos was in 1833, during his expedition to the surroundings of the present city of Bahía Blanca, southern Buenos Aires province (Fig. 1). There, he observed a layer that was less than a meter thick, composed of small pebbles, essentially porphyritic rocks
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A194
Periodical contribution:
Darwin in Argentina. Revista de la Asociación Geológica Argentina 64, no. 1 (February 2009): 1-180.
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particularly interesting to read about his impressions and views on Argentine society in times of severe turmoil, when Juan Manuel de Rosas (whom he met personally) was growing as a political figure in the conflictive scenario that was at the time the Argentine Confederation. Darwin set foot for the first time on Argentina's soil in Patagonia when the Beagle arrived on August the 3rd off the mouth of the Río Negro. He traveled afterwards overland to Bahía Blanca, Buenos Aires, and Santa Fe. On
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A194
Periodical contribution:
Darwin in Argentina. Revista de la Asociación Geológica Argentina 64, no. 1 (February 2009): 1-180.
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PDF
. Further north, the rocks deposited during the Patagonian transgression are included in the Chenque and Gaiman formations, in the San Jorge Basin. In southern Chile, these rocks are known as Guadal Formation, and are exposed south of Lago General Carrera. The basement rocks underlying the Cenozoic deposits are a Jurassic lava-pyroclastic complex known as Bahía Laura Group, including the Chon Aike Formation (ignimbrites and scarce rhyolitic lavas and tuffs) and the La Matilde Formation (tuffs
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A622
Periodical contribution:
Ghiselin, Michael T. 2009. Darwin: A reader's guide. Occasional Papers of the California Academy of Sciences (155 [12 February]), 185 pp, 3 figs.
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, observations on pulmonate slugs together with terrestrial flatworms AUGUST 22, arrived at Punta Alta near Bahia Blanca AUGUST 24, more observations on Sagitta at sea AUGUST 30, observations on ctenophores at sea SEPTEMBER 2 4, observations on Sagitta (and other animals) at sea SEPTEMBER 6 OCTOBER 17, Bahia Blanca area SEPTEMBER 22, OCTOBER 8, Punta Alta (near Bahia Blanca) fossils SEPTEMBER 27 29, observations on Sagitta at sea off Bahia Blanca OCTOBER 8, Trigonocephalus recorded OCTOBER 8
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A622
Periodical contribution:
Ghiselin, Michael T. 2009. Darwin: A reader's guide. Occasional Papers of the California Academy of Sciences (155 [12 February]), 185 pp, 3 figs.
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, trip to salt lake AUGUST 11 SEPTEMBER 20, overland trip from Rio Negro to Buenos Aires AUGUST 13, reached camp of General Rosas AUGUST 15, meeting with General Rosas AUGUST 24, arrived at Bahia Blanca AUGUST 25 28, visit to Beagle AUGUST 29 SEPTEMBER 6, Punta Alta fossil collecting SEPTEMBER 8, continued land journey; Beagle sailed SEPTEMBER 20 26, Buenos Aires SEPTEMBER 27 NOVEMBER 4, expedition to Santa Fe and return to Montevideo OCTOBER 1, Parana River fossils OCTOBER 3 4, sick in bed in Santa
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A622
Periodical contribution:
Ghiselin, Michael T. 2009. Darwin: A reader's guide. Occasional Papers of the California Academy of Sciences (155 [12 February]), 185 pp, 3 figs.
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Hobart MARCH 4 5, observations on confervae at sea MARCH 6 14, King George's Sound, Australia APRIL 1 12, Cocos-Keeling Islands APRIL 29 MAY 9, Mauritius MAY, Red Notebook begins around this time MAY 31 JUNE 15, Cape of Good Hope JUNE 3, first meeting with Sir John Herschel JUNE 8 15, socialized with Herschel and others JUNE 28, FitzRoy/Darwin paper on Tahiti written at sea JUNE 29, crossed Tropic of Capricorn JULY 8 14, St. Helena JULY 19 23, Ascension Island AUGUST 1 6, Bahia, Brazil AUGUST 12
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