Dates The
temples were the result of several phases of construction from 5000 to 2200
BC. There is evidence of human activity in the islands since the
Early Neolithic Period (), attested by pottery
sherds, evidence of fires, and bones. The dating and understanding of the various phases of activity in the temples is not easy. The main problem found is that the sites themselves are evolutionary in nature, in that each successive temple brought with it further refinement to architectural development. Furthermore, in some cases, later Bronze Age peoples built their own sites over the
Neolithic temples, thus adding an element of confusion to early researchers who did not have modern dating technology.
Sir Temi Żammit, an eminent Maltese archaeologist of the late nineteenth century, had dated the Neolithic temples to 2800 BC and the Tarxien
Bronze Age culture to 2000 BC. These dates were considered "considerably too high" by scholars, who proposed a reduction of half a millennium each. However,
radiocarbon testing favoured Żammit's dating. A theory that the temple art was connected with an
Aegean-derived culture collapsed with this proof of the temples' elder origins.
Temple phases The development of the chronological phases, based on recalibrated
radiocarbon dating, has split the period up to the
Bronze Age in Malta into a number of phases. The first evidence of human habitation in the Neolithic occurred in the Għar Dalam phase, in c. 5000 BC. The Temple period, from c. 4100 BC to roughly 2500 BC, produced the most notable monumental remains. This period is split into five phases; however, the first two of these left mostly pottery shards. The next three phases, starting from the Ġgantija phase, begins in c. 3600 BC, and the last, the Tarxien phase, ends in c. 2500 BC.
Ġgantija phase (3600–3200 BC) The
Ġgantija phase is named after the
Ġgantija site in
Gozo. It represents an important development in the cultural evolution of Neolithic humans on the islands. To this date belong the earliest datable temples and the first two, if not three, of the stages of development in their ground plan: the lobed or kidney-shaped plan found in
Mġarr east, the trefoil plan evident in Skorba, Kordin and various minor sites, and the five-apsed plan Ġgantija South, Tarxien East.
Saflieni phase (3300–3000 BC) The
Saflieni phase constitutes a transitional phase between two major periods of development. Its name derives from the site of the
Hypogeum of Ħal-Saflieni. This period carried forward the same characteristics of the Ġgantija pottery shapes, but it also introduces new biconical bowls.
Tarxien phase (3150–2500 BC) The
Tarxien phase marks the peak of the temple civilisation. This phase is named after the temple-complex at Tarxien, a couple of kilometres inland from the
Grand Harbour. To it belong the last two stages in the development of the temple plan. The western temple at Ġgantija represents, along with other units in Tarxien, Ħaġar Qim and L-Imnajdra, the penultimate stage in development, that is, the introduction of a shallow niche instead of an apse at the far end of the temple. The final stage is testified in only one temple, the central unit at Tarxien, with its three symmetrical pairs of apses. The Temple culture reached its climax in this period, both in terms of the craftsmanship of pottery, as well as in sculptural decoration, both free-standing and in relief. Spiral reliefs resembling those at Tarxien once adorned the Ġgantija temples, but have faded to a level where they are only clearly recognisable in a series of drawings made by the artist
Charles Frederick de Brocktorff in 1829, immediately after the temples' excavation. The Tarxien phase is characterised by a rich variety of
pottery forms and decorative techniques. Most shapes tend to be angular, with almost no handles or lugs. The
clay tends to be well prepared and fired very hard, while the surface of the scratched ware is also highly polished. This scratched decoration remains standard, but it becomes more elaborate and elegant, the most popular motif being a kind of
volute. ==Architecture and construction==