"One day he remarked, without lifting his head, 'In the interior you will no doubt meet Mr. Kurtz.' On my asking who Mr. Kurtz was, he said he was a first-class agent; and seeing my disappointment at this information, he added slowly, laying down his pen, 'He is a very remarkable person.' Further questions elicited from him that Mr. Kurtz was at present in charge of a trading post, a very important one, in the true ivory-country, at 'the very bottom of there. Sends in as much ivory as all the others put together. . .' He began to write again. The sick man was too ill to groan. The flies buzzed in a great peace."

Identify and explain Joseph Conrad's formal or informal writing style in this passage from The Heart of Darkness, citing specific examples from the text.