I hate to stick my neck out by disagreeing with a resident geologist, but all my evidence points to it being this.

The Penguin Dict. of Geology defines craton (or kraton) as "a major structural unit of the Earth's crust, consisting of a large stable mass of rock, generally igneous and/or metamorphic, sometimes with a thin veneer of sediment. A typical kraton is the Canadian (Precambrian) Shield. Blocks which have been termed 'oceanic' or 'submarine' kratons probably do not conform to this definition. 'Kraton' is practically synonymous with 'shield'. "

Portion of a continent that has been structurally stable for a prolonged period of time
http://geotech.fce.vutbr.cz/wwwroot/scripta/geologie/Glossar...

The Colorado Province is a CRATONIZED Proterozoic basement that underlies ... The Colorado Province forms a CRATONIZED Proterozoic mobile belt of island arc ...
www.wsgs.uwyo.edu/metals/wyoming_craton.aspx

BP 3 additional areas had been CRATONIZED as is shown in Figure 9 below. ... Imagine (some 300+ million years ago) WA being an ancient CRATONIZED region, ...
humanities.cqu.edu.au/geography/GEOG11023/week_2.htm

images show that Australia’s economic diamond deposits lie at step changes in lithospheric thickness within dominantly CRATONIZED Proterozoic provinces with ...
www.mcc.monash.edu/twiki/ view/Bibliography/BibEntry100434?raw=on

that were deposited on RECENTLY CRATONIZED crust (Conway and Silver 1989). Higher up the section, along with increasing sediment maturity (Condie et al. ...
www.journals.uchicago.edu/JG/ journal/issues/v112n3/112304/112304.text.html

The period is characterised by expansion of existing platform covers, or by new platforms on RECENTLY CRATONIZED basements. ...
en.wikipedia.org/wiki/Calymmian

No difference from the French:
craton - Vaste portion stable du domaine continental par opposition aux zones instables déformées ... L'auteur de ce terme distinguait les aires stables océaniques (en allem.: Tiefkraton) des aires stables continentales (Hochkraton). Seul ce dernier sens est resté dans notre langue. V. aussi bouclier ...
[Dictionnaire de géologie, Foucault & Raoult, Masson]