Showing posts with label Homo heidelbergensis. Show all posts
Showing posts with label Homo heidelbergensis. Show all posts

Saturday, 13 March 2021

THE 'CIAMPATE DEL DIAVOLO', HOMO HEIDELBERGENSIS

Today, The Grandma has received interesting news from Joseph de Ca'th Lon, one of her closest friends.
 
Joseph is in Naples visiting the Ciampate del Diavolo, where an article in Nature identifies fossilized hominid footprints preserved in pyroclastic flow deposits that dated to around 350,000 years ago on a day like today in 2003.

The Ciampate del Diavolo, in Neapolitan Devil's Footprints or Devil's Trails, is a locality near the extinct Roccamonfina volcano in northern Campania, Italy.

It is named after fossilized hominid footprints preserved in pyroclastic flow deposits that have been dated to around 350,000 years ago.

They have been attributed to bipedal hominids, possibly Homo heidelbergensis, which is known to have inhabited the region at the time.

The footprints comprise three sets of tracks indicating that three hominids made their way down a steep slope on the flank of the volcano, away from the crater. The tracks were preserved under a layer of volcanic ash and were revealed by erosion, probably in the late 18th to early 19th century. Local people attributed the prints to the Devil as they regarded him as the only being capable of walking on lava without harm.

They were identified as hominid footprints after archaeologists examined them in 2002 and are the second oldest set of hominid footprints known outside Africa, after the Happisburgh footprints.

The area in which the tracks appear is an eroded layer of rock covering about 2,000 m², tilted at an angle of about 45°, in a forest on the side of the volcano. The footprints consist of three sets of tracks which descend a steep slope created by a pyroclastic flow.

More information: Discover Campania

The first, identified as Trackway A, measures 13.4 metres and consists of 27 prints from left and right feet descending 4.26 metres vertically along a Z-shaped course. It testifies to a careful descent down a steep and probably unstable slope. 

Trackway B is 8.6 metres long and descends 2.91 metres vertically along a single curved route. Less care was taken with this part of the descent, as slips and irregularities indicating stumbles are visible. Finally, the less well-preserved 

Trackway C measures 9.98 metres along a single straight line which descends 2.56 metres vertically.

Occasional handprints are visible where the track-maker sought support on the steep slope, and a couple of animal paw marks made by a big dog or wolf are also visible.

Until the discovery of the Happisburgh footprints in England in 2013, they were the oldest known hominid footprints outside Africa. The tracks were originally dated to between 385,000 and 325,000 years ago, but subsequent studies using argon-argon dating placed the date more precisely as around 349-350,000 years ago.

The pyroclastic deposits in which the footprints were imprinted were laid down around 349,000 years ago (±3,000 years), while the layer of volcanic ash which subsequently covered and preserved them was deposited around 350,000 years ago (±3,000 years). The footprints are thought to have been exposed by erosion caused by heavy precipitation and landslides in the early 19th century, when the name Ciampate del Diavolo was first recorded.

The track-makers are estimated to have been about 1.56 metres tall and to have been travelling at a speed of 1.09 metres per second. Based on the age of the tracks, they have been tentatively ascribed to the hominid Homo heidelbergensis, a probable ancestor of the Neanderthals. As the tracks point away from the volcano's crater, it is possible that they were made while the track-makers were trying to escape an eruption. There was certainly an eruption following the track-makers' passage, as the tracks were buried under a subsequently erupted layer of volcanic ash which preserved them to the present day.

More information: Science Alert

Based on the small stature of the individuals, it has been suggested that the prints were made by children.

The tracks were known locally for many years, as they are situated near a trail that was established in the 18th century between the villages of Tuoro/Foresta and Piccilli. Local people attributed them to the Devil, the only being considered capable of walking on lava without burning his feet, but despite this the site was not considered cursed or threatening.

In 1986 a writer suggested that the footprints might have been created in historic times by a human. It was not until 2002 that they were first brought to scientific attention by two amateur archaeologists who noticed them and informed archaeologists at the University of Padua.

A cattle path through the forest formerly crossed the fossil tracks and caused accelerated erosion at that point, but since 2001 the vegetation around the tracks has been cleared away and the exposed rock protected by fencing. The tracks were initially thought to have been made by prehistoric elephants but when Paolo Mietto and two other researchers from the University of Padua investigated them, they were surprised to find that the tracks were of hominid origin.

It is very rare to find preserved hominid footprints in open-air environments, where they are vulnerable to erosion; most examples are found in enclosed and thus better protected environments such as caves.

More information: Forbes


One of the few things that can be said
for certain about Europe's prehistoric peoples
is that they all came from somewhere else.

Norman Davies

Tuesday, 6 September 2016

ATAPUERCA: HOMO HEIDELBERGENSIS' HOMETOWN

Homo Heidelbergensis 

Homo heidelbergensis – also Homo rhodesiensis – is an extinct species of the genus Homo that lived in Africa, Europe and western Asia between 600,000 and 200,000 years ago. The skulls of this species share features with both Homo erectus and anatomically modern Homo sapiens; its brain was nearly as large as that of Homo sapiens. 

Although the first discovery - a mandible - was made in 1907 near Heidelberg in Germany where it was described and named by Otto Schoetensack, "the great majority of fossils attributed to Homo heidelbergensis have [only] been obtained recently, beginning in 1997." The Sima de los Huesos cave at Atapuerca in northern Spain holds particularly rich layers of deposits that "represent an exceptional reserve of data" where excavations are still in progress. 

Neanderthals, Denisovans, and modern humans are all considered to have descended from Homo heidelbergensis that appeared around 700,000 years ago in Africa. Fossils have been recovered in Ethiopia, Namibia and South Africa. Between 300,000 and 400,000 years ago a group of Homo heidelbergensis migrated into Europe and West Asia via yet unknown routes and eventually evolved into Neanderthals.

Archaeological sites exist in Spain, Italy, France, England, Germany, Hungary and Greece. Another Homo heidelbergensis group ventured eastwards into continental Asia, eventually developing into Denisovans. The African Homo heidelbergensis (Homo rhodesiensis) population evolved into Homo sapiens approximately 130,000 years ago, then migrated into Europe and Asia in a second wave at some point between 125,000 and 60,000 years ago. The correct assignment of many fossils to a particular chronospecies is difficult and often controversies ensue among paleoanthropologists due to the absence of universally accepted dividing lines (autapomorphies) between Homo erectus, Homo heidelbergensis and Neanderthals. Some researchers suggest that the finds associated to Homo heidelbergensis are mere variants of Homo erectus.



MIGUELÓN IN THE SIMA DE LOS HUESOS, ATAPUERCA (BURGOS)

Miguelón's skull and jaws
Miguelón (considered to be 400,000 years old) is the popular nickname for the most complete skull of an Homo heidelbergensis ever found

More than 5,500 human fossils of this species, which are considered to be the direct ancestor of Homo neanderthalensis, have been found in the Sima de los Huesos ("pit of bones") site in the Sierra de Atapuerca in northern Spain. 

The excavators suggest that this concentration of bones in the pit may represent the practice of burial by the inhabitants of the cave. A competing theory cites the lack of small bones in the assemblage and suggests that the remains were washed into the pit by natural agents.

Miguelón's bony pelvis
Miguelón, around thirty years old, had 13 impacts in the head and died of septicemia resulting from broken teeth. In his upper left jaw there is an important bone alteration, with evidence of alveolar infection. According to Juan Luis Arsuaga, professor in Paleontology, a tooth had been broken in life by a strong blow, so that the flesh had been exposed and led to an infectious process that continued until nearly the orbital bone. The cranial capacity is around 1100cc. 

The nickname Miguelón was derived from Miguel Indurain, a retired Spanish road racing cyclist that won the Tour and Giro in 1992, the year in which this skull was discovered.



If we turn to palaeontology to tell us about our biological evolution it is to prehistory that we look for evidence of the evolution of specifically human patterns of behaviour.
John G.D.Clark