Westerns with odd punctuation

The book also features McCarthy's somewhat unusual writing style – there are, for example, many unusual or archaic words, no quotation marks for dialogue, and no apostrophes to note dropped letters.

(Wikipedia page for Blood Meridian)

Another western novel where the author experiments with punctuation (or the lack of it) is R. A. Lafferty's Okla Hannali, first published in 1972. In the book, all the dialogue uttered by choctaw characters (like the protagonist) has no punctuation at all:

"Maybeso you exaggerate," his son Travis would say. "Of course I do with a big red heart I exaggerate the new age has forgotten how I remember that the corn stood taller and the ears fuller nine of them would make a bushel and now it takes a hundred and twenty that doesn't consider that the bushels were bigger then the men were taller and of grander voice the women of a beauty to be found nowhere today except in my own family the girls sang so pretty with voices they walked so fine when they carried corn they could soft-talk you like little foxes those girls."

Lafferty offers a rationale for his stylistic choice, which may or may not have some historical basis:

Hannali did not speak in that manner because he was a clod, but because he was a Choctaw. Whether in English or Choctaw, all Chocs run sentences together with no intonation for either period or question. The educated Choctaws of that day -those who wrote in their own hands- punctuated either not at all or excessively. In official depositions one will find page-long screeds with no break at all. Or one will find random punctuation, with commas between almost every word, and perhaps a colon or semicolon between an article and its following noun. Someone had told them that they must punctuate, but nobody would ever be able to tell them how.

It could also be understood as an external form of Molly Bloom's internal monologue. I think it succeeds in giving the dialogue a sense of immediacy.