https://www.yumpu.com/ro/document/view/20363794/hoofdstuk-13-de-cambrische-explosie

CAMBRISCHE EXPLOSIE (Artikel )

met aantekeningen

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1.- Met het “cryogenium” is in elk geval bedoeld : de allereerste bottle-neck en globale ijstijd waar de levende materie doorheen moest ….http://nl.wikipedia.org/wiki/Cryogenium

2.-Voorafgaand aan het ediacariaan was er al de avalon explosie (ergens in het late Tonium ? of zelfs nog vroeger )

AVALON

3.- er wordt in dit artikel verondersteld dat o.a. de charnia afstammelingen zijn van (eukaryote) eencelligen die op hun beurt afstamden van de cyanobacteria ( of andere luca netwerken ) in symbiose met primitieve ( reeds ontwikkelde eveneens eukaryote ) schimmels … Een andere geopperde “verklaring” zou de genetische bijdrage zijn van virussen die fungeerden als gen vectoren en/of een endosymbiose in de nucleus van en met dergelijke primitievere eukaryoten , aangingen

- De oudste dierlijke fossielen zijn gevonden in GABON ….

GABONESE chips

http://ascendenza.wordpress.com/tag/gabon/

- Vooral in Namibie zijn trouwens ook de afzettingen en sporen van de nog veel oudere oudste “eencelligen” ( o.a; amoeben ) gevonden

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(1) (het oorspronkelijke artikel ) veronderstelde dat de allereerste trilobieten ( of eerste oogdieren ) slechts licht en donker konden onderscheiden

http://en.wikipedia.org/wiki/Trilobite “…..The earliest trilobites known from the fossil record are fallotaspids, and redlichiids (both order Redlichiida) and bigotinids (order

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Fanerozoïcum Paleozoïcum Cambrium later

Proterozoïcum

Neoproterozoïcum

Ediacarium 635 - 541

Cryogenium 850 - 635

Tonium 1000 - 850

Mesoproterozoïcum

Stenaium 1200 - 1000

Ectasium 1400 - 1200

Calymmium 1600 - 1400

Paleoproterozoïcum

Statherium 1800 - 1600

Orosirium 2050 - 1800

Rhyacium 2300 - 2050

Siderium 2500 - 2300

Archeïcum Neoarcheïcum vroeger

Indeling van het Proterozoïcum volgens de ICS.[1]

Ptychopariida, superfamily Ellipsocephaloidea) dated to some 540 to 520 million years ago.[6][7] Contenders for the earliest trilobites include Profallotaspis jakutensis (Siberia), Fritzaspis spp. (western USA), Hupetina antiqua (Morocco)[8] and Serrania gordaensis (Spain).[9]

All trilobites are thought to have originated in present day Siberia, with subsequent distribution and radiation from this location.[6]….”

(2) http://en.wikipedia.org/wiki/Arthropod_eye Trilobite eyes

The eyes of trilobites came in three forms. The holochroal eye, the most common and most primitive, consisted of many small lenses, between 100-15000, covered by a single corneal membrane. This was the most ancient kind of eye. This eye morphology was found in the Cambrian trilobites (the earliest) and survived until the Permian extinction.[15]

The more complex schizochroal eye was found only in one sub-order of trilobite, the Phacopina (Ordovician-Silurian). It has no modern counterpart. The eye has up to 700 larger lenses with individual sclera separating each lens. Each lens has a cornea. Schizochroal eyes developed from holochroal ones and were more powerful with overlapping visual fields. They were particularly useful for nocturnal vision and possibly for colour and depth analysis. The lenses of the eye were constructed from single calcite crystals. Early schizochroal eye designs were rather haphazard and irregular, though constrained by the geometrical requirements of packing identical sized lenses on a curved surface. Later designs used graduating lens sizes.[15]

The third eye morphology of trilobites, called the abathochroal, was found only within the Eodiscina. This morphology consisted of up to 70 much smaller lenses. The cornea separated each lens, and the sclera on each lens terminated on top of each cornea. The eye morphology of trilobites is useful for determining their mode of life, and can function as palaeoenvironmental indicators.[15]

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