In 1946, the archaeologist and priest Henri Fleisch from Saint Joseph University made an unstratified, open-air survey of the marine terraces of Ras Beirut, and recovered various artifacts.

It is an important site for Quaternary studies and has been published in various works by Fleisch, Auguste Bergy in 1932,[6] L. Dubertret in 1940 and 1948, Wright in 1960 and 1962,[7][8] Raoul Describes in 1921,[9] Dorothy Garrod in 1960 and R. Neuville in 1933.

Intervening periods including the Levalloiso-Mousterian were well represented in surface finds along with a substantial amount of Neolithic material on a 45 metres (148 ft) terrace.

[11] Ras Beirut III or Depots A. and B. is northeast of Rue Jinnah and was again found by Father Fleisch who published his studies in 1950 and 1956.

[12] Early Levalloisian industries were found including bifacial Bir Hassan picks in the 20 centimetres (7.9 in) layer on the bedrock.

A layer of pebbles, marine shells and flints in the sandstone was found by Auguste Bergy and studied by Dubertret in 1937 and 1940, de Vaumas in 1947, Haller in 1945, Fleisch in 1956[12] and 1962,[15] Howell in 1959[14] and Dorothy Garrod in 1960.

A Micro-Levalloisian industry was found by Henri Fleisch and published in 1948 and 1956 dating to the time when the 15 metres (49 ft) sea level regressed.

Material was recovered in brecciated beach deposits representing a Levalloisian industry with traces of Micro-Levalloisian, this was studied by Fleisch and published in 1954[16] and 1956.

The material is suggested to date to the time when the sea had retreated from the 15 metres (49 ft) level and consists of a Levalloisian industry with Mousterian influence with large, thin flakes.

[12] Material was suggested to be of the Levallois form with some Bir Hassan picks similar to those at Ras Beirut III and IV but from a different level.

[11] Ras Beirut XI or Minet ed Dhalia is on the second headland south of Pigeon Rock on the 15 metres (49 ft) terrace and was excavated by Raoul Describes in 1914, publishing his studies in 1921 and originally suggesting he had found a large number of tools and waste from a Solutrean industry in the black soil that covered the limestone headland at a depth of 1 metre (3.3 ft).

[9] Neuville and Haller studied the site and materials again in 1933, reclassifying it as Chalcolithic with a lower Middle Paleolithic level along with an intervening later that Describes had missed.

It has been described by Lorraine Copeland and Peter Wescombe as "probably the richest factory site in Lebanon" with hundreds of pieces recovered and held in the National Museum of Beirut.