Helen and Geoff's Amazing Adventures

Have fun and do neat stuff

Roman bridge across the Rhone

I am a Roman bridge across the Rhone

by | Feb 27, 2013 | France

I am a Roman bridge across the Rhone

In its lower reaches the Rhone is a big wide river. The Roman bridge across the Rhone was not fixed but consisted of a pontoon-style bridge of boats, with towers and drawbridges at each end. The boats were secured in place by anchors and were tethered to twin towers built just upstream of the bridge. This unusual design was a way of coping with the river’s frequent violent floods, which would have made short work of a conventional bridge. Nothing now remains of the Roman bridge, which has been replaced by a more modern bridge near the same spot.

Arles always struggled to escape the shadow of Massalia (Marseilles) further along the coast. Its chance came when it sided with Julius Caesar against Pompey, providing military support. Unlucky Massalia backed Pompey; when Caesar emerged victorious, Massalia was stripped of its possessions, which were transferred to Arelate as a reward. The town was formally established as a colony for veterans of the Roman legion Legio VI Ferrata, which had its base there.

Amphitheater

Amphitheater

Arelate was a city of considerable importance in the province of Gallia Narbonensis. It covered an area of some 99 acres (400,000 m²) and possessed a number of monuments, including an amphitheatre, triumphal arch, Roman circus, theatre, and a full circuit of walls. Ancient Arles was closer to the sea than it is now and served as a major port. It also had (and still has) the southernmost bridge on the Rhone.

The city reached a peak of influence during the 4th and 5th centuries, when Roman Emperors frequently used it as their headquarters during military campaigns.

Shield Shrimp

When it rains across Australia’s vast inland region, temporary pools crop up all over the arid ground, giving life to a strange desert crustacean known as the shield shrimp (Triops australiensis).

Named after the formidable carapace that shields its head and upper body, T. australiensis can grow up to 7.6 cm long, and it uses its long, segmented tail and mass of 60 or so legs to propel itself through shallow water.

It also breathes through these legs – its sub-class Branchiopoda means ‘gill-legged’ – and in the females these legs bear ovisacs for carrying their tiny eggs.

Several pix in the Photo Gallery and a movie.

Acacia peuce

A rare and endangered plant. The tree grows up to 15 to 18 metres (49 to 59 ft) high, with short horizontal branches and pendulous branchlets covered in needle-like phyllodes adapted for the arid dry climate. It has a distinctive habit more similar to a sheoak or a conifer.

Although speculated to have been widespread across central Australia during wetter climates 400,000 years ago, the population is now mostly restricted to three sites, separated by the encroaching Simpson Desert. In the Northern Territory, the species is restricted to the Mac Clark (Acacia peuce) Conservation Reserve which is surrounded by a pastoral lease, Andado Station. The other two sites are near Boulia and Birdsville in Queensland. The tree is found in open arid plains that usually receive less than 150 millimetres (5.9 in) of rain per annum. They grow on shallow sand aprons overlaying gibber or clay slopes and plains and between longitudinal dunes or on alluvial flats between ephemeral watercourses.

 

Owen Springs Reserve on Hugh River

Owen Springs was a station on the Hugh River. The Hugh River flows into the Finke (when it actually flows). Both cut through the Western MacDonnell Ranges. The image above shows Owen Springs Reserve as a dot at lower right. The river it is next to is the Hugh. Hermannsburg, our next town, is near middle left edge. Hermannsburg is almost on the Finke River. You can see both Hugh and Finke Rivers cutting through sections of MacDonnell Ranges.

Palm Valley

Palm Valley is within the Finke Gorge National Park southwest of Alice Springs. Palm Valley has a smallish population of Red Cabbage Palms (Livistona mariae). The nearest related species is 850 kilometres away in Katherine NT. The average rainfall for Palm Valley is just 200 mm per year. Small pockets of semi-permanent spring-fed pools allow the unique flora and fauna (desert fish, shield shrimps tadpoles and frogs) to survive.

It had been assumed that the cabbage palms were remnants of a prehistoric time when the climate supported tropical rainforest in what is now the arid inland of Australia. Genetic analysis published in 2012 determined that Livistona mariae at Palm Valley is actually the same species as Livistona rigida from samples collected near Katherine and Mount Isa, both around 1,000 kilometres (620 mi) away. It is now thought that aboriginal people brought the palms to here from Mataranka.

Mound Springs

Mound Springs occur around the Western edge of the Great Artesian Basin and represent a natural discharge of Artesian water that was captured many hundreds of kilometers away from rain falling along the Great Dividing Range and New Guinea. This article provides details. Dalhousie is an excellent example of a mound spring.

Great Artesian Basin map Great Artesian Basin diagram