Did People Pilgrim Between Taş Tepeler Sites? The Isotope Test

Göbekli Tepe has been called the world's first cathedral. Karahan Tepe, 35 km away, has been called a parish temple. The other ten sites in the Taş Tepeler ("Stone Hills") network — spread across 200 km of southeastern Anatolia — have been called satellites, seasonal hubs, regional ritual centers. The metaphors differ. The underlying question is the same: did the same people move between these sites during their lifetimes?

If they did, the Taş Tepeler network is more than a geographically clustered set of contemporaneous sites. It is the world's first documented pilgrimage circuit — predating Stonehenge by 7,000 years, predating the Hajj by 11,000 years, predating the ancient Egyptian pilgrimage system by 9,000 years.

The test is achievable with existing methods. It has not been done.

What the sites are

The Taş Tepeler project, launched 2021 by the Turkish Ministry of Culture and Tourism, now coordinates research across 12 sites in the Şanlıurfa region of southeastern Turkey, all dating to the Pre-Pottery Neolithic A and B periods (~9600–7000 BCE):

Site	Distance from Göbekli	Notable features
Göbeklitepe	0	Circular enclosures A–D; 200+ T-pillars; fully excavated (partial)
Karahantepe	35 km	Subterranean chambers; 250+ T-pillars; 2025: human-face pillar, first rectangular room, oldest staircase
Sayburç	~35 km	2022: vivid feasting-scene relief sculpture with human figures
Sefertepe	~40 km	2025: new monumental structures discovered
Harbetsuvan Tepesi	~50 km	Less excavated
Gürcütepe	~25 km	Twin mounds
+ 6 others	Across 200 km	Geomagnetic survey identified 15+ additional sites

As of 2025, the project involves 36 academic institutions and 220 archaeologists and specialists — the largest coordinated prehistoric excavation in history.

What we know from diet isotopes

Stable carbon and nitrogen isotopes (δ¹³C, δ¹⁵N) from human bone collagen reveal dietary patterns with regional specificity. A 2025 analysis suggested that Göbekli Tepe gatherings may have occurred mid-summer to autumn, based on the availability of wild cereals, pulses, almonds, and pistachios — and stable isotope data allowing inference of the gathering season for larger groups.

But dietary isotopes tell us what people ate, not where they came from. The critical tool for geographic origin is strontium isotopes.

How strontium isotopes reveal mobility

When humans eat and drink, the strontium (Sr) ratio in local water and food — determined by the local geology's ratio of ⁸⁷Sr to ⁸⁶Sr — is permanently incorporated into developing tooth enamel. Adult tooth enamel does not remodel. It preserves the strontium ratio from childhood, reflecting where the individual grew up.

This provides a precise geological fingerprint:

Local geology produces a characteristic ⁸⁷Sr/⁸⁶Sr ratio (typically ~0.704–0.720 in the Near East)
A non-local value in a skeleton's tooth enamel = the individual moved from their childhood home to their burial location
Multiple individuals with the same non-local value = a group that all came from the same place

Combined with oxygen isotopes (δ¹⁸O, recording rainfall and temperature at the location where enamel formed), strontium provides a two-dimensional fingerprint of geographic origin.

The 2025 Syrian Neolithic baseline

The most directly relevant recent study: a 2025 Scientific Reports paper measured strontium and oxygen isotope values in 71 human teeth from five archaeological sites in Syria, spanning the entire Neolithic period.

Key findings:

Early Neolithic sites (PPNA/early PPNB) show heterogeneous strontium ratios, suggesting individuals from multiple geographic origins were buried together
Later Neolithic sites (late PPNB → Chalcolithic) show convergence toward local strontium ratios, suggesting communities increasingly stayed in one place — the consolidation of village life
The transition point in the Syrian data aligns with the shift from forager mobility to settled agriculture

This establishes exactly the methodological precedent needed for Taş Tepeler. The technique works for this period and region. The geological baseline is being built.

What the missing study would look like

The proposed isotope analysis for Taş Tepeler pilgrimage:

Input: Human skeletal remains from 3+ Taş Tepeler sites (teeth preferred for enamel stability; molars for childhood origin, first incisors for early childhood)

Analysis:

⁸⁷Sr/⁸⁶Sr in tooth enamel from each individual
δ¹⁸O in tooth enamel from each individual
Establish local geological baseline at each site using soil, fauna, and local water sources
Identify outliers with non-local signatures

Test:

If same non-local signatures appear at multiple Taş Tepeler sites → the same people (or their descendants from the same community) visited multiple sites. A pilgrimage network.
If non-local signatures are site-specific → sites were visited by different regional populations. A confederation of communities, not a pilgrimage circuit.
If all signatures are local → people built these monuments without long-distance movement. The cathedral-parish model is wrong — they were all local.

2025 season discoveries and their implications

The 2025 excavation season at Taş Tepeler produced several significant findings that add urgency and context:

Karahan Tepe (November 2025): Discovery of the first rectangular room in the Taş Tepeler network. All previous rooms were circular or oval — following the enclosure tradition of Göbekli Tepe. A rectangular room suggests either a different function or a later developmental stage. The architectural innovation could be site-specific (suggesting different populations building differently) or could reflect a network-wide transition happening at different rates.

Karahan Tepe (February 2026): Discovery of the oldest known staircase — a deliberate vertical movement architecture that implies organized circulation within the site. Staircases imply an architecture designed for use by many people moving through it — a public or ritual flow of bodies through space.

Karahan Tepe (2025): A T-shaped pillar carved with a clearly defined human face — suggesting narrative or identity-specific iconography that differs from the animal-dominated Göbekli iconography. If Göbekli sites depict animals and Karahan sites depict human faces, the sites may have been performing different ritual functions within a shared network.

Göbekli Tepe + Sefertepe (November 2025): New monumental structures discovered at both sites, suggesting the network is larger and more interconnected than previously known.

These 2025 findings all push toward the same question: are these sites nodes in a system, or independent structures?

The 2023 PNAS precedent

A 2023 PNAS study using both strontium isotopes and ancient DNA analyzed PPNB (Pre-Pottery Neolithic B) mobility across Southeastern Anatolia and the Southern Levant — the same time period and overlapping geography as Taş Tepeler.

Key finding: PPNB populations show multi-scale mobility — individuals moving over distances of hundreds of kilometers, with evidence of marriage exchange networks and seasonal labor pooling. Some communities show significant genetic mixing with populations from hundreds of km away.

This directly implies that the capability for long-distance mobility existed. The question is whether Taş Tepeler's ritual sites specifically drew people from across the network range.

Has it been done?

As of June 2026, no published study has specifically tested the pilgrimage hypothesis using strontium/oxygen isotopes on skeletal material from multiple Taş Tepeler sites simultaneously.

The Taş Tepeler project does include a bioarchaeology program. The 2025 isotope results from dietary reconstruction suggest the analysis infrastructure is in place. The missing step is:

Multi-site sampling strategy designed explicitly to test geographic overlap
Published comparison across sites (not just within each site)

This is a tractable gap. The method is mature. The question is pointed.

Why this matters beyond archaeology

If a pilgrimage circuit is confirmed, Taş Tepeler rewrites several timelines:

The origin of pilgrimage: currently assigned to Bronze Age religions. Pushed back to 9600 BCE — before agriculture.
The scale of social coordination: hunter-gatherers coordinating multi-hundred-kilometer seasonal movements for ritual purposes, simultaneously building the world's largest monuments. The motivation puzzle deepens.
The acoustic network hypothesis (see concept tas tepeler acoustic network): if the sites were differentiated by frequency (Göbekli at 69 Hz, Karahan Tepe at a different predicted resonance), and if people moved between them, the pilgrimage route would be an acoustic journey — traversing a deliberately curated sequence of perceptual experiences encoded in stone. This is 12,000-year-old experiential design.

The cross-realm connection: acoustic ecology and pilgrimage

The Taş Tepeler pilgrimage question connects unexpectedly to concept acoustic tipping points via the concept of acoustic richness as a signal of sacred space quality. Modern reef bioacoustics establishes that healthy ecosystems have high acoustic diversity (ADI); degraded ecosystems go silent. If ancient builders deliberately designed sites for acoustic richness — and chose between sites based on their resonant properties — then pilgrimage was in part about seeking high-quality acoustic experience, just as reef fish larvae today seek high-ADI soundscapes as habitat selection cues. Both are organisms navigating acoustic landscapes as proxies for environmental health and sacred quality.

Key Sources

"Strontium and oxygen isotope analysis reveals changing connections to place and group membership in the world's earliest village societies." Scientific Reports (2025). — 71 teeth from 5 Neolithic Syria sites; the methodological precedent.
"Isotopic and DNA analyses reveal multiscale PPNB mobility and migration across Southeastern Anatolia and the Southern Levant." PNAS (2023). — PPNB mobility documented; capability for long-distance movement confirmed.
Turkish Ministry of Culture and Tourism Taş Tepeler project reports, 2024–2025 seasons. — First rectangular room, oldest staircase, human-face pillar.
"Who built Gobeklitepe? Hidden world of Taş Tepeler's hunter-gatherers." Türkiye Today (2025). — 36 institutions, 220 specialists, 12+ sites overview.

Abhishek