The Numidian Flysch Formation is a regionally extensive series of deep marine sandstones and mudstones which crop out in Spain, Morocco, Algeria, Tunisia, Sicily, and southern mainland Italy. The formation is dated as Oligocene to mid Miocene and represents an approximately linear series of submarine fans characterised by a quartz rich petrofacies. Their unique regional extent is nearly twice the length of the Angolan margin although issues surrounding provenance and basin context have hampered understanding. The Numidian Flysch Formation was deposited into the Maghrebian Flysch Basin (MFB) which was a foreland basin remnant of the neo-Tethys ocean in the western portion of the present day Mediterranean Basin. The basin was bordered to the north by an active margin which consisted of a southward verging accretionary prism, underlain by European crustal blocks which rode above northwards subducting oceanic crust. To the south, the African margin formed a passive-margin to the basin.The huge amount of geophysical and outcrop data which is becoming increasingly available suggests that submarine slope systems are more complex than previously thought, including topographically complex slopes, a wide variety of density flow types, and flow transformations. This thesis aims to review the sedimentology of the Numidian Flysch Formation in Sicily and Tunisia in light of these developments. Constraining the provenance and basin context of the formation is therefore of paramount importance, and this is also addressed.Commonly used evidence for the provenance of Numidian Flysch sandstones include its quartz rich petrology, an Eburnian and Pan-African age detrital zircon suite, its structural position within the foreland fold and thrust belt, and complex palaeocurrent orientations. when reviewd in their entirety and placed in context of other basin successions, the Numidian Flysch is constrained to a depositional location in the south of the basin, with polycyclic sediment sourced from African basement. The Numidian Flysch Formation is therefore a 'passive margin' sequence as opposed to a flysch sensu stricto. The timing of Numidian Flysch deposition is also coincidental with uplift of the Atlas chain in North Africa, during a period of significantly wetter conditions. A switch from carbonate to clastic deposition results from these conditions, and the Numidian Flysch Formation is considered an offshore extension of this regional sedimentation.Characterisation of outcrops in Sicily and Tunisia shows remarkably similar lithofacies and depositional elements. Sinuous upper slope channel complexes are entrenched within slope deposits to a depth of 100 m and occur within channel systems up to 5.7 km in width. They are filled predominantly with massive ungraded sandstones interpreted to aggrade through quasi-steady turbidity currents, interbedded with normally graded turbidites. Channel elements are subseismic in scale, are nested within complexes and show sinuosity. Coupled with lateral offset stacking, this strongly affects the architecture and facies heterogeneity of channel complexes. When compared to globally reviewed data, the thickness of channel elements as shown through their frequency distribution also suggests a fundamental control upon the degree of slope incision which is as yet unconstrained.In lower slope settings, channel complexes stack aggradationally with a width of over 1000 m. They are also predominantly filled with massive sandstones in fining upwards cycles, and show heterogeneous margins and large scale slumping. In central Sicily, large channel complexes are overlain by a stacked lobe complex, in turn overlain by a channel lobe transition zone. This progression coupled with palaeocurrent variability suggests intraslope deformation strongly impacts transiting flows through changes in flow capacity. Salt tectonics, present in Algeria and Tunisia is a possible forcing mechanism.Taken in context, the sections in Sicily record a proximal to distal palaeogeographic trend which is reconstructed towards the north/northeast once well constrained tectonic rotations are taken into account. Given regional similarities, controls upon slope architecture are interpreted to be similar throughout the basin, and deposits in Sicily therefore provide a good analogue for the remainder of the basin. These results therefore allow for a better constrained fan architecture, along with the allogenic controls upon them. Given the continental extent of this formation, the Numidian Flysch Formation provides a unique opportunity to study controls upon fan architecture once provenance and intraslope topography is factored in.

Le théâtre de Bulla Regia est un des mieux conservés de Tunisie. Malgré l'intérêt certain qu'il représente son étude nécessite de tenir compte du contexte monumental dans lequel il est apparu celui du secteur constitué par les deux "esplanades" situées au Sud et à l'Ouest. La première partie de la thèse est consacrée à l'étude du théâtre proprement dit. Elle se fonde sur l'ensemble des relevés des structures en place, la description des vestiges et l'étude des blocs épars. Le monument a été interprété et restitué par comparaison avec d'autres théâtres romains bien connus situés de façon préférentielle en Afrique. L'étude présente les dessins de restitution de l'édifice en plan, élévation et coupe, ainsi que sa modélisation informatique. La recherche a démontré que le monument a connu deux états successifs. C'est en effet à la suite d'une extension que sa façade est venue mordre sur la rue située au Nord. La seconde partie s'attache à l'étude du contexte monumental auquel le théâtre est lié. Elle commence par un chapitre technique qui définit les caractéristiques des murs numides par rapport aux murs romains. Il était fondamental de pouvoir restituer son évolution chronologique et principalement de distinguer les caractéristiques de son organisation à l'époque numide. L'étude des monuments s'est intéressée à tous les temples situés au sud du théâtre, avec leurs relevés, l'étude de leurs blocs épars et leur restitution architecturale. Pour la première fois a été proposée, sur des bases solides, la restitution d'un temple d'époque numide (le temple B).Dans la dernière partie ont été discutées les trois hypothèses possibles relatives à la fonction véritable du complexe monumental constitué par les deux esplanades et le théâtre. Il a été démontré qu'il ne pouvait s'agir d'un sanctuaire organisé autour d'un temple principal ni d'un grand gymnase de tradition grecque. La seule hypothèse satisfaisante est celle qui consiste à considérer que le premier état du complexe (à l'époque numide) aurait correspondu à un palais. Celui-ci aurait compris une partie résidentielle (autour de l'esplanade B) et une partie sacrée à laquelle le théâtre était lié (autour de l'esplanade A). Cette recherche nous éclaire sur la fonction et l'évolution d'une partie importante de la ville et révèle l'existence d'un programme architectural particulièrement rare en Afrique (une résidence royale numide). Cette thèse est celle d'un architecte dont le mérite est d'avoir réalisé pour la première fois un relevé très précis une description et une interprétation poussée de ce complexe. Elle soulève des questions soumises à la réflexion de la communauté scientifique qui devraient encourager la réalisation de sondages et de fouilles permettant de confirmer et de consolider l'hypothèse avancée. / The theatre of Bulla Regia is one of the best preserved in Tunisia. Its study needs to take in consideration the monumental context constituted by the two "esplanades" situated to the south and the west and linked to it. The first part of this study concerns the theatre itself. It includes the surveys of the structures, a precise description of the remains, and the registration of the scattered blocs. It concerns the functioning of the monument and its architectural restitution. The monument have been interpreted and restituted by comparison with other well-known roman theatres mainly situated in Africa. The study presents restitution drawings in plan, elevation and section and a computing model. It has demonstrated the existence of two successive states. The limits and the caracteristics of the two states have been studied. The superposition of the new façade of the theatre with the north street is the consequence of an extension of the building. The second part concerns the study of the monumental context linked to the theatre. It begins by a technical chapter giving a key for the interpretation of the whole sector. It gives a clear definition and the caracteristics of the numid walls by opposition to the roman ones. This is fundamental to restitute the chronological evolution of the complex. The study examines afterwards all the temples situated to the south: it gives a whole survey of the remains, a study of the scattered blocs and an architectural restitution for each monument. A relative dating of these monuments has been exposed. It also has been proposed the restitution of a numid temple (temple B) according to the study of its remains and their iconography (representations on coins). In the last part, have been discussed three possible hypotheses concerning the probable function of the monumental complex (a great sanctuary, a great gymnasium in the Greek tradition or to consider that the first state of the complex corresponded to a palace). The complex would have included a residential part (esplanade B) and a sacred one (esplanade A) including the theatre. The results of this research overcome largely the interest of a study limited to a theatre. They in light on the function and evolution of a major part of the city and reveal the existence of a program particularly scarce in Africa (a royal residence). The study gives an accurate survey of the monuments and a deep interpretation of this complex. It does arouse important questions worth to encourage the realization of excavations allowing confirming and consolidating the proposed hypothesis. Its underlines the major interest of this sector and can favor the initiatives that would help its preservation and presentation.

La chute de Carthage devant les armées romaines en (146 avant J.-C.) est contemporaine de la constitution de grands États : celui des successeurs de Massinissa, en Afrique du Nord centrale et celui des maures en Afrique du Nord occidentale. Ces États étaient attachés à leur génie propre, qui trouvait longtemps sa meilleure expression dans l’œuvre unificatrice et expansionniste de Massinissa et de ses successeurs, notamment Jugurtha et Juba Ier, de même que dans les prouesses en diplomatie du roi maure Bocchus l’Ancien. Ces rois avaient œuvré, par divers moyens, pour l’édification d’un vaste État africain, original, puissant, unifié sous le même sceptre, et relativement à l’abri de toute ingérence. De nombreux indices témoignent de la continuité et de l’originalité des États maures et numides : une population regroupée notamment autour des villes, nommées « villes royales » par les Romains ; les frappes de monnaies dites de Massinissa et de ses successeurs ; le commerce avec le monde méditerranéen surtout avec Carthage, les Gétules, les Îles Grecques, l’Espagne, et bien sûr avec Rome ; l’armée numide, de par ses prouesses en guerre face à l’armée romaine, constitue un témoignage probant que Jugurtha était un fin stratège et un chef militaire hors pair ; il en va de même pour Juba Ire, qui avait non seulement organisé un État, mais administré également une armée très efficace ; une armée montée selon les normes méditerranéennes alors en cours, donc moderne en cette époque de l’Antiquité. Par ailleurs, dans le domaine religieux, ces États ont laissé des traces monumentales (tombeaux et mausolées). Ces vestiges religieux prouvent que même au moment où la romanisation pesait de tout son poids, cette civilisation a su, en dépit de superficielles adaptations, préserver son originalité. / The fall of Carthage in front of the Roman armies (146 BC) is contemporary of the constitution of big States: that of the successors of Massinissa, in central North Africa and that of the Moors in western North Africa. These States were attached to their appropriate genius, which found for a long time its best expression in the unifying and expansionist work of Massinissa and his successors, in particular Jugurtha and Juba I, as well as in the exploit in diplomacy of Moorish king Bocchus the Old. These kings had worked, by diverse ways, at the construction of a vast African, original, powerful State, unified under the same scepter, and with regard to the shelter of any intervention. Numerous indications testify of the continuity and the originality of the Moorish and Numidian States: a population grouped in particular around cities, named " royal cities " by Romain; the said striking’s of coins of Massinissa and his successors; the trade with the Mediterranean world especially with Carthage, Gaetulians, the Greek Islands, Spain, and of course with Rome; the Numidian army, due to its exploit at war in front of the Roman army, constitute a convincing testimony that Jugurtha was a fine strategist and an outstanding military leader; It's the same for Juba I, who had not only organized a State, but also administered a very effective army; an army taken up according to the then current Mediterranean standards, thus modern in this time of the Antiquity. Besides, in the religious domain, these States left monumental tracks (graves and mausoleums). These religious vestiges prove that even as the romanization pressed with all the weight, this civilization knew how to, in spite of superficial adaptations, protect its originality.