The antenna guy

Ben walking with the magnetometer

Johannes helping Ben with the GPR

Archaeology is not about digging anywhere. There are more and more ways to discover if there are archaeological features beneath our feet before excavation. And that is exactly the job of Benjamin, our Antenna Guy. His antenna is actually a magnetometer, an instrument that measures spatial variations in the strength of the magnetic field. The presence of iron, brick, burned soil and certain rocks causes anomalies in the Earth´s magnetic field and the magnetometer reacts strongly to these. The information is transformed into a grey-scale map that allows archaeologists to locate possible features. Unfortunately, it is not always easy to distinguish man-made features from natural phenomena. Besides, subtle features maybe hidden by highly magnetic materials.

Ben spends his days walking with his antenna or with his ground penetrating radar (GPR) between small red and white flags, recording the strength and velocity of the soil´s magnetic response. During this process, no one is allowed in the area: a belt buckle or even a paper clip would interfere and would be registered as anomalies by the magnetometer.

After one week of work, the results come out: the hill´s magnetic map is relatively homogenous, except for an area north of trench C, which shows a strong magnetic anomaly. The excavation does not yield any solid archaeological structure though. We nevertheless notice that the soil of the area contains numerous small metallic balls (about 1mm in diameter). Are they natural? Are they residues from metal working? Opinions are divided. We hope that the analysis of the samples will give us an answer. 

A day´s work

The excavation has started since one week now and everyone is getting used to the daily routine of the fieldwork. We wake up around 6.30, take a (cold) shower, a breakfast and get in the car. It is a 15 minutes drive to the foot of Bukit Gombak, then an 8 minutes climb to the top. The work starts at 8.00 and finishes at 16.00. With their hoes, the workers scrap the first centimeters of earth, while the archaeologists look for ceramics, observe, measure, fill the forms in, sort the finds and take pictures of the different excavation units (strata) .

Up to now, we have opened three trenches of 9m x 9m each, in order to explore three different areas: the top of the hill (trench A), the eastern slope (trench B) and 

the small plateau to the north (trench C). 

Jon, Feri, Soni, In, Samsiwar and Yarli in trench C

In trenches B and C, the material is abundant and diversified (pottery, Chinese ceramics, metal objects, obsidian), but trench A, contrary to what we expected, is poor in material. Besides, we have learned from our workers that the site used to be ploughed with a tractor until 5-6 years ago and we are wondering whether the archaeological layers are still in place or have been completely disturbed. In any case, we hope that the artifacts will give us a good idea of the duration and the type of occupation of the hill. A quick look at first the ceramics and metal artifacts seems to confirm our hypothesis, that Gunung Gombak was indeed a settlement site as early as the 14^th. Some of the objects that we have recovered are clearly of a more recent date though, such as a VOC coin found in trench C. We still hope to find more tangible traces of a building, but so far nothing.

Pottery sherds found in two hours in trench C

Burning point



Smiling Kilian in front
of one of the landmarks



Slowly but surely, problems are being solved. Dominik has all the necessary authorizations and the Total Station has no secrets for Annika, Johannes and Kilian anymore. The preparation work may begin.

Andrison, a topographer from the local Institute for preservation of cultural heritage (BP3) walks through the high grass and keeps running up and down, taking measurements for the topographical map. Meanwhile, our Total Station team has chosen a series of landmarks that will help us to localize the trenches and the finds.

Two workers have started cleaning the site in the traditional way, cutting the grass and burning the ground.  A thick smoke now covers Bukit Gombak, and though the place has become less bucolic, some of us seems to find pleasure in playing with fire.



Marking the first trench



But the most moving moment of the day is undoubtedly the delimitation of the first trench, at the top of the hill. In a few days, the whole hill will be cleared, the three trenches will be marked and the real work will begin. Everyone anxiously awaits the digging. Some team members even let their imagination go. For Johannes and Véronique, it will be a wooden palace with few ceramics and a  couple of Changsha bowls (imported from China, they are easy to identify and excellent chronological markers for the 9th century). For Sekar and Annika, it will be an inscription, even a short one (to make Arlo forget that they are not ready with their essays yet?). Will our craziest dreams come true? We'll soon know.






Atop the smoky hill

 


Sekar keeps smiling







Annika and Baskoro playing with fire



Debut

Our base camp

Welcome on the website of the Tanah Datar archaeological project!

Thanks to Indiana Jones, archaeologists have earned a reputation of adventurers and treasure seekers. However, very few archaeologists fit this profile - and none of us does. So, forget about Hollywood and learn about the every day life on our excavation.

It all started a couple of years ago, when Dominik and Mai-lin got the idea of excavating at the top of the Gombak Hill, near Batusangkar, in the province of West Sumatra. The landscape was beautiful, the food delicious and the site promising. A few sherds and a fourteenth century inscription convinced them that going through the lengthy process of searching for subsidies was worthwhile. For most of us, however, the adventure really began on Saturday, when we left Jakarta and embarked on a plane to Padang.

Bukit Gombak before the excavation

From Padang, a three hour drive brings us to our base camp in Tanah Datar, where we are introduced to our hosts and settle in our new house. The house actually looks more like a four star hotel than like the usual excavation house. Instead of a dormitory we find spacious rooms for two or three persons. Our first visit to the site leaves us an excellent impression. The hill is covered with grass. It is a sunny, airy place with a few trees and a magnificient view on the surrounding plain and on the Merapi mountain.

Monday, Dominik must make sure that we have all the necessary authorizations - from the local governor to the owner of the land that we want to excavate. First disappointment. One letter is missing and we are not allowed to start the excavation. Annika, Kilian and Johannes, who went back to Bukit Gombak, try to install our brand new total station - it is supposed to give us the position of any structure on the site. In vain. 

Hopefully, tomorrow is another day.

Johannes et Kilian trying to install the station

Tanah Datar: Early state formation in relation to lowland and highland exchanges on Sumatra

Sumatra is renowned since the earliest times for its gold, camphor and precious forest products. The island has yet another asset: its strategic location, for Sumatra borders the Strait of Malacca, one of the world’s busiest maritime routes. For 2000 years trade linking China and India and points further west has passed its shores. Sumatra, and particularly its eastern coast, was thus a favourable place for early polities to develop. These coastal polities derived their wealth from controlling the Strait of Malacca and from trading hinterland products on the international market. Highland regions and lowlands polities developed over time complex interactions which we begin only to understand.

The Tanah Datar project will focus on the time of Ādityavarman (1343-1375), a late ruler of Malayu, who established himself in the Minangkabau area. His reign, documented by 14^th century inscriptions, constitutes the only chronological anchor for the early history of the region. The aims of the research are: 1) to get a better insight of the relation with the lowlands and its effect on the socio-economic conditions of the highlands, 2) to document the material culture at the transition between pre- and early state formation in the highlands.

This year, the field work (5 March – 17 April 2011) will include:

1. Excavations at Bukit Gombak

The potential centre of the reign of Ādityavarman lies on Bukit Gombak, a slope south of Batusangkar. This hill lies in the middle of the fertile plain of the valley of Tanah Datar (“flat land”) south of the volcano Gunung Merapi. Here the oldest Ādityavarman-inscription in the highland of Sumatra dating to the year 1356 was found which mentions the existence of a palace, the erection of cloister and temple buildings. In the vicinity of Bukit Gombak more inscriptions and fragments of sculptures were unearthened in addition to surface finds of local pottery and Chinese porcelain of the Song-dynasty (960-1279). At the potential settlement area of Bukit Gombak (600m x 250 m) test pits and at least three wider areas will be excavated to investigate a stratigraphy and to recover archaeological remains. The surveys will examine sites of Pagarruyung, Kuburajo, Saruaso and Pariangan where inscriptions were found but no archaeological remains. The inscription of Batu Bapahat mentions the construction of irrigation canals possible traces of which will be investigated by geophysical measurements and archaebotanical analyses.  

2. Survey of megalithic sites

Megalithic remains are documented in three valleys of the Minangkabau region of West Sumatra: Mahat in the North, Sinamar in the centre and Tanah Datar in the South of this region. They either form cluster of up to 400 stones or they are upright standing and single monuments. Most of them are not decorated, some are rounded and shaped as swords (kris-shape) from 1-4 m height.

3. Survey of the inscriptions

The aim of this part of the Tanah Datar Project is to study and publish a complete corpus of the inscriptions issued by Ādityavarman. Even though all we know thus far about this king is based on his inscriptions, several have not been edited at all and none has been translated into English or Indonesian directly from the original. The aim of this part of the project is therefore to place this historical record on sound and comprehensive footing by providing critical editions of all the relevant documents with annotated translations, good images that allow verification of the (often problematic) readings, and relatively elaborate explanations of the language and contents of the inscriptions, to allow non-philologists to understand the pitfalls in their interpretation.