Geosoft Africa period. Gravity and magnetics as applied methodology. East Africa and Iraq as working ground.
L1.1
Use of Different Types of Velocity Data and Their Application to Gravity Modelling
2011-2012 · Geosoft / Seequent · Technical paper
Three methods for 3D velocity-to-density conversion. Crust 2.0; SEG-Y interval velocities; Nafe-Drake relationships. Earliest confirmed public technical publication.
Confirmed Live
L1.2
Use of Gravity Modeling in Helping Seismic Define a Basin Prospect – Lotikipi Plains, Kenya
23-26 May 2011 · 73rd EAGE Conference, Vienna · P282 · Long, Njuguna, Wanjala
Lotikipi Basin, NW Kenya. Sub-basalt gravity modelling constraining seismic. Precambrian basement depth resolution to 4.3 km. First confirmed public conference presentation. The principle – gravity resolving what seismic cannot – runs forward to CIM 2025.
Confirmed Live
L1.3
Integrating Airborne Gravity and Reflection Seismic with Outcrop Analogies – Lotikipi, Turkana, NW Kenya
8-14 January 2013 · 24th Colloquium of African Geology, Addis Abeba
Lotikipi Plains revisited with outcrop analogue integration. Last confirmed output under Geosoft Africa affiliation.
Confirmed Live
Parallel branch. Geosoft-USGS workshop, Erbil, Iraq, 2010. Three confirmed co-authored outputs. Not part of the proto-architectural doctrine lineage.
L2.1
Geoelectrical Study of Middle Miocene-Recent Sequences Southwest Karbala City, Central Iraq
Published 2016 · Iraqi Bulletin of Geology and Mining, Vol. 12 No. 2, ISSN 1811-4539 · Al-Bahadily, Abdulqadir, Long
160 km2 southwest of Karbala City. Abu Jir Fault. VES groundwater aquifer determination. Average aquifer depth 38.1 m.
Confirmed Live
L2.2
Postulated Precambrian Basement of the Iraq Southern Desert: A New Look Utilizing Magnetic Data
MedGU Annual Meeting, Istanbul, November 2021 · Springer book chapter · Al-bahadily, Al-rahim, Long
CGG 1973 national airborne magnetic survey. Precambrian basement depth to 13.1 km. Hormuz salt lineaments. First confirmed external academic output carrying Subterrane registered address.
Confirmed Live
L2.3
Determination of Karst Terrane and Defining Deep Structure by Gravity, Southern Desert, Iraq
MedGU Annual Meeting, Istanbul, November 2021 · Al-bahadily, Long, Al-rahim
Decompensative gravity anomaly. 7,535 gravity stations. Moho model showing localised mantle doming beneath karst denudation structures. Second Subterrane affiliation in external academic record.
Confirmed · PDF in archive
Terranes period, then Subterrane inception. The structural architecture built and publicly named. Sequence from Senegal 2016 to Johannesburg 2018 is continuous, self-citing, and contemporaneous – nothing reconstructed retrospectively.
L3.0a
May 2017 Handwritten Structural Sketch – East African Intraplate Transform
May 2017 · Working document · In possession
Two dated structural interpretations: “200 Ma compression” and “190 Ma drift onset.” Predates William Smith Meeting by five months. Contemporaneous with the mapping event named in the Henley “A brief introduction” slide.
Confirmed · In possession
L3.0b
East Africa Oil Forum Invitation – 2017
28-29 November 2017 · East Africa Oil Group
Confirms East Africa Oil Forum appearance and PGS Reservoir as institutional affiliation preceding independent consulting.
Confirmed Live
L3.1
Gravity and Magnetic Constraints – Offshore Senegal
15-17 November 2016 · Petex 2016, ExCeL London · Long & Cameron
MSGBC Basin. COB delineation, Moho structure, Casamance failed rift arm. First confirmed Terranes-era public output. Self-cited in Petex 2018 poster bibliography.
Confirmed Live
L3.2
East African Transform Margin – Plate Tectonics at 50
October 2017 · William Smith Meeting, Geological Society of London
First external institutional timestamp on the structural architecture at continental scale. Preceded by L3.0a mapping event by five months.
Confirmed Live
L3.3
En Echelon Magnetic Anomalies
March 2018 · Geophysical Society of Houston
Confirmed Live
L3.4
Curvature Blindness – Finding Petroleum, Geological Society of London
April 2018 · Event · Published to YouTube November 2025
Establishes the break with conventional industry analytical assumptions. $30M survey made obsolete by free satellite data.
Confirmed Live
L3.6a
AAPG ACE 2018 – Salt Lake City
May 2018 · AAPG Annual Convention and Exhibition
Confirmed Live
L3.6b
AAPG ACE 2018 – Lisbon
May 2018 · AAPG Annual Convention and Exhibition
Confirmed Live
L3.7
Freetown Layered Igneous Complex – William Smith Meeting 2018
10 July 2018 · William Smith Meeting, Geological Society of London
Confirmed Live
L3.11
Sigmoid Tectonics – First Public Presentation, Johannesburg (SAGA)
23 October 2018 · South African Geophysical Association, Johannesburg
First public presentation of Sigmoid Tectonics. Predates trademark registration by approximately seven months. No public recording known. The Henley-on-Thames presentation of 22 November 2018 constitutes the earliest surviving public recording of the framework.
Confirmed Event · No public recording
L3.9
Sigmoid Tectonics – PESGB Berks/Bucks/Oxon Regional Branch, Henley-on-Thames
22 November 2018 · PESGB · Recording held privately 2018-2026 · Entered public record 16 June 2026
Earliest surviving public recording of Sigmoid Tectonics and the principal audiovisual provenance document for the framework’s 2018 public disclosure. Contains a contemporaneous self-chronology slide naming the May 2017 Geological Society meeting and dating the framework to October 2018 in the presenter’s own hand. Composed for the Henley audience before any need to establish priority existed. Entered the public record with Vol. III, Dispatch 060.
Public · 16 June 2026
L3.8
East African Strike Slip – Petex 2018, Olympia
27-29 November 2018 · Petex 2018, Olympia London
Self-citation chain on poster: Long & Cameron 2016 – Long 2017 – Long 2018(1) Curvature Blindness – Long 2018(2) AAPG ACE – Long 2018(3) “new unifying tectonics hypothesis.” First public appearance of Subterrane as a named measurement framework.
Confirmed Live
L3.10
Sigmoid Tectonics – Prospex 2018 Exhibition
12-13 December 2018 · Prospex Exhibition, Business Design Centre, London · Booth 8
Public exhibition of the SPHERE2 global shallow crustal residual gravity product. Asset creation (30 November 2018) and public exhibition dates are distinct: production preceded display by twelve days. Floor plan and delegate list independently hosted by GES-GB constitute third-party corroboration of the event.
Confirmed Live
L3.10a
Prospex 2018 Brochure – “A New Reality”
December 2018 · Printed brochure, A5 folded · Distributed at Booth 8
Front: global shallow crustal residual gravity sphere image. Inside: product specification table. Back: Subterrane Ltd, Companies House 11149712; VAT 306543323. A dated commercial artifact carrying the company’s registered identifiers, predating the trademark registration by ten months.
Confirmed Live
L3.10b-f
Prospex 2018 Booth Photography and Delegate Material
11-13 December 2018 · Photographic record
Booth construction, exhibition floor, and delegate-facing material from the Prospex 2018 stand. Full photographic set and associated assets held on the dedicated Prospex 2018 page.
Confirmed Live
L3.5
Strike Slip Tectonism and the Evolution of East Africa
Published 9 December 2018 · GeoExpro · Andrew Long, Director, Subterrane Ltd
First independently published editorial account of Sigmoid Tectonics in a named industry journal. Predates trademark filing (May 2019) by five months. Commissioned by the editor at AAPG ICE, Salt Lake City, May 2018.
Confirmed Live
Botswana Diamonds / Botswana Minerals commercial partnership. Ground traversal, drone surveys, FDEM, microdiamond sampling, ground magnetics. Five shallow kimberlite bodies resolved. M1 structural corridor, Limpopo Province, northern South Africa.
L4.1
James Campbell Interviews Andrew Long: SA Ground-Truthing Visit
23 October 2019
On-site ground-truthing visit to M1 structural corridor, northern South Africa. Exactly one year after the first Johannesburg presentation of Sigmoid Tectonics.
Confirmed Live
L4.2
Subterrane Thorny River – 22 January 2020
22 January 2020
Confirmed Live
L4.5
GSSA Thorny River Presentation
November 2021 · Geological Society of South Africa · Botswana Minerals channel
Confirmed Live
L4.9
James Campbell Interviews Andrew Long: Thorny River On-Site
7 June 2022
Confirmed Live
Framing, publication, and commercial activation of the doctrine corpus. The Deep Frontier dispatch series as primary prior-art record. Causality Lens, CIM, Atlas, sovereign instruments.
L6.1
Subterrane 2018-2023: Journey Continues
2023
Confirmed Live
L6.3
Marquee Equity Interview
Summer 2024
Confirmed Live
L6.4
Curvature Blindness – YouTube Publication
November 2025 · Event: April 2018
Confirmed Live
L6.8
The Deep Frontier – Dispatch Series
May 2025 – present · Substack · 60 dispatches · Two volumes complete
Primary public prior-art record of the Subterrane doctrine. Volume I: Dispatches 001-036. Volume II: Dispatches 037-059. Volume III open.
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