Quechua, Cajatambo North Lima

I thought for a while that Ethnologue lumped the speakers of this language/dialect together with the Cajatambo North Lima Quechua, misled by the 'North Lima' wording, but it does not look like that on closer reading of the Location section.  It is very specific in saying that in Lima it only includes speakers of Cajatambo, Copa, Huancapón, and northern Manas districts.  Now, what do we do about the Quechua speakers in Lima's provinces of Oyón and Huaura?  On the 2006 map of Quechua languages by Richard Aschmann, to which I refer in my earlier comments on Yauyos Quechua and Chincha Quechua, this language is called in Spanish 'Quechua del Checras (Oyón),' which means Quechua of the Checras [River Valley] (Oyón Province).  Although talk has been going on since the late 1990s about the disappearance of Oyón Quechua, data from the 2017 census in Peru shows us that this language was still spoken then by at least 1,892 persons, with the Ethnic Population standing at least about 12,000 or maybe even higher.  The Quechua of Picoy, described by J. Creider in 1967 in the book 'Cuatro Fonologías Quechuas' (pp. 43-52), belongs to this language, as it is located in Huaura province's Santa Leonor district, which, according to the 2017 census, still had 30 Quechua speakers -- the smallest number among the districts where the language was still spoken in 2017.  The largest number was in Oyón district, which had 1,067 speakers, while the entire Oyón province had 1,509 speakers of Quechua.

On Picoy Quechua we also have this 2019 publication: Escobar, E.; Valqui, J. (2019). Estudio dialetológico del quechua central en el poblado de Picoy. Tierra Nuestra, 13(1): 23-50.  It is based on field study done in June 2018, which involved 15 L1 speakers aged 60-90.

I will try to insert the image of the 2006 map here.