When and where was Portland Downtown Black Triangle documented?

This encounter was documented on October 10, 2009 in The Nines Hotel area, Portland, Oregon, Oregon, United States.

What sources and physical claims back the Portland Downtown Black Triangle record?

The ANOMALY archive indexes 1 independent source citations across 3 claims, achieving a provenance completeness score of 100%.

ENC-902429LANDMARK CASE · HIGH CORROBORATIONDATE PRECISION: exactRECORD COMPLETENESS: 100%

October 10, 2009The Nines Hotel area, Portland, Oregon, Oregon, United States

Rooftop-patio report of a large silent black triangle crossing downtown Portland and banking south.

// PROVENANCE COVERAGE

This measures documentation coverage, not whether the encounter or its claims are true.

1 SOURCES · 0 PRIMARY

Date documented

October 10, 2009

Location documented

The Nines Hotel area, Portland, Oregon, Oregon, United States

Map coordinates available

Coordinate precision: site.

Catalogue classification linked

1 family link(s), 1 case-specific component(s).

Published citation-backed claims

2 encounter-target claim(s), 1 component claim(s).

Source coverage

1 unique source edition(s); 0 marked primary for at least one claim.

Assessment has encounter-level provenance

2 encounter-target published claim(s) can carry assessment provenance.

This dossier currently depends on a single source edition; independent coverage would strengthen comparison.

No cited source is currently marked as primary for the published claims shown here.

// ASSESSMENT METADATA

ENCOUNTER-CLAIM PROVENANCE PRESENT

Stored total witness estimate30

Stored verified-report count0

Instrumental evidence flagNO

Official investigation flagNO

// ENCOUNTER LOCATION · OPENSTREETMAP

COORDINATE PRECISION: SITE