were introduced after an abrupt cooling event in the Early Mesolithic associated with erosion and wildfires; a similar climate event 1,000 years later coincided with the appearance of small backed bladelets and invasively retouched microliths
, and an even newer trapeze-shaped arrowhead replaced these older microliths
at the same time as a third cooling and drought-causing event another 1,000 years later.
"One type is characterized by round or oval microliths
that may have a genetic basis and the other by irregular bosselated microliths
that are largely due to mitral stenosis."  Confirmation with CT scan, scintigraphy, transbronchial biopsy can be done.
Fiberoptic bronchoscopy was done along with bronchoalveolar lavage, in which microliths
Microscopically, the background testicular tissue often shows dysgenetic features, including impaired spermatogenesis, tubular atrophy, and microliths
. IGCNU and Leydig cell hyperplasia are frequently present.
Y dystiolaeth y tro yma oedd haenen dena o gregyn y mr yn ymddanogs o dan y graig ac wrth gloddio dyma ddod o hyd i ddarnau bach o gallestr (microliths
) a hefyd lle tn.
The charcoal flecks led to the discovery of worked flints, including distinctive Middle Stone Age "microliths
" - the small flint blades which were used as barbs and points set in arrows and harpoons.
In the second are prehistoric finds from other local sites, including the loans from the National Museum of Wales: from the little Upper Cave, a few metres above Kendrick's own, excavated by the late Tom Stone in the 1970s, teeth, implements of flint, antler and bone, and potsherds; other finds of Stone's from Pant y Wennol, in the same district, scored animal bone, microliths
and Neolithic stone tools and potsherds, and part of a Neolithic skull; stone axeheads; a hammer, rough-out and flakes from the Graig Llwyd axe factory; and the fragment of an ancient tree found off-shore.
An example of abandonment practices can be drawn from Maglemose Culture where certain concentrations of microliths
and hearths surrounded by nuts could indicate traces of deserting patterns.
"From a study of stone axes, pottery and microliths
, an archaeologist working in Ghana (Paul Ozanne) has recently concluded that 'Ward's suggestion that 600 years ago, the Accra plain was uninhabited must be ignored; a belt of ten or six miles wide along the coast has certainly been wells populated for a great deal more than 1,000 years, probably for the most part by the Ga-Adangbe people'.
The most commonly occurring formal artefacts in glass from the WA arid lands include tula adzes and slugs, burren adzes, steep-edged, concave and discoidal retouched/utilised flakes, geometric microliths
, and engravers.
Similar remains, including microliths
(small blade tools/flints), have been found in the deserts of middle Asia.
Finding a couple of microliths
lying there on the grey sand, exposed by weathering, was an experience I have not forgotten.