three diamond allotropes (cubic diamond, lonsdaleite, and n-diamond) in an extraterrestrial (ET) impact layer (the YDB), dating to the Younger Dryas onset at 12.9 ka
rounded to highly angular, and range in size from 1 to 1700 nm with most between 1 and 50 nm. Concentrations are up to 3700 ppb, equaling more than 1 billion diamonds per cm3 of sediment (comparable to K/T levels of 3600 ppb).
No diamonds were detected above or below the YDB layer at any site tested.
These diamonds could not have formed from volcanic activity, because they combust at temperatures above 500°C in the presence of atmospheric levels of oxygen, and micrometeoritic diamonds are similarly destroyed. Also, the diamonds could not have accumulated from the constant rain of micrometeoritic debris, because multi-billions occur in YDB layer samples, but yet none have been found in non-YDB strata dating from 55,000 RCYBP to present.
EM VERDADE VOS DIGO QUEIMEM SÓCRATES EM CICUTA
E NOVAS RELVAS SURGIRÃO PARA QUEIMAR EM AUTOS DE CAFÉ
POIS SE AS ERVAS DANINHAS SÃO AQUELAS QUE NÓS PERCEPCIONAMOS
SÃO TAMBÉM AS MAIS COMPETITIVAS
POIS COMO DIZ O PAPÁ SMURF NO SEU LIVRO À ABORDAGEM MARUJOS
O ESTADO DEPENDE DUM CORSÁRIO COM MUITOS S.S.'S AO LUME D' ÁGUA
E OUTROS NO TOMBADILHO
PARA ARRANCAREM O CARVÃO DE ALTA PRESSÃO
AOS ANIMAES EXTINTOS PELOS PROCESSOS LEGAIS
YDB diamonds are associated with abundance peaks in magnetic spherules, carbon spherules, soot, and iridium, which can peak in impact layers of known ET events, such as the K/T and the 1908 airburst at Tunguska, Siberia. Furthermore, a high proportion of the nanodiamonds are found deeply embedded within spherical particles of melted plant resins, a fact inexplicable by any normal terrestrial process. Altogether, this evidence strongly suggests that the widespread and abundant nanodiamonds constrained to the thin YDB layer resulted from a major ET impact/airburst at 12.9 ka.