This paper is an attempt to synthesize the occurrences of Tertiary coal deposits in relation to the Tertiary sedimentary l;asin development, es~cially in its stratigraphic position. Rodern 1:asin classifications bJ Klemme (l!!'l2) and Murphy (l!!'l5) are revie~ for Indonesiao Tectonic framew:,rk of Tertiary sedimentary 1:asins bl] Koesoemadinata an.d Pulunggono is used as basis for lasin classification. Indonesia is suhi~vided into o.o tectonic regions; western Indonesia with the Sunda landmass as continental core, surrounded bJ sedimentary basins along its periphery "'1ich developed into an island arc system, and eastern Indonesia with the Sahul Shelf as continental core. Both areas slx:,w different lasin development.
In western Indonesia the Tertiary transgression is usually preceeded 1:y a Paleogene intramontane lasin development, where blockfaulting played an important role and nonmarine sedimentation generaly took place, with few marine ingression in early Eoceneo Coal seams deposited within these J:s.sins are interbedded between lacustrine, fluviatile, alluvial plain deposits, and near shore depositso The coal seams tend to be limited in extent, rut with numerous vertical distrihltion."'1I'hese la.sins a•re presently
ex-posed along the mountain ranges of the inner volcanic arc, such as the anhilin 1:asin in M=st Sumatra, the Bayah and Cimandiri coal fields in west Java, and in local uplifts behind the inner volcanic arc, such as the Meratus Range and Pasir basin in South-eastern Kalimantan. The Paleogene coal fields in the south SulaM=si, the Pangkajene, Kasama and Enrekang coal fields, are also considered to be deposited in intramontane 1:asin, the southern arm of Sulawesi being considered as a volcanic inner arc which has l:een rifted from the continental mass of southern Kalimantan bj the Strait af• 1"akassar oceanic spreading ceneer , Behind the volcanic inner arc a Neogene lasinal lack-deep developed where marine elastic sedimentation continued, superimposed on the Paleogene intramontane 1:asins, locally with an unconformity. This marine sedimentation
O)cle terminated with a regressive seauence where vast swampy areas developed resulting into extensive coal deposits, such as in south Sumatra lasinal areao The coal is more lignitic in nature, unless it is locally intruded bj igneous activity near the volcanic range, such as being mined at; Buki t Asam coal field, where the coal is highly upgraded. Coal in the regressive sequence is less developed in northern Java,hlt in the Barito lasin in southern Kalimantan thick coal seams are known.
) In eastern Kalimantan marginal la.sins developed as the result of - ~ocene rifting of Sulawesi from Kalimantan, and tw large deltas prograded from the Sunda landmass in the fest over the oceanic crust of the Strait of• IJakassaro In the s-wampy deltaic plains extensive coal beds are deposited since• Miocene time, which continue until recent times. Coal in this areas ere expected to be of varying qualityo In eastern Indonesia coal lasins are exclusively developed in Irian Jaya, the northern periphery of the Sahul stable mass. The development of t:hese lasins is different from western Indonesia. At the beginning of ft:?rtiary a vast carh:mate platform developed with 'su tmerine (?) volcanic activity in the norhtern continental margin, which became extinct in later

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