The phrase "a further mark" is correct and usable in written English.
It can be used when referring to an additional indication, sign, or level of something, often in a formal or academic context.
Example: "The study revealed a further mark of improvement in the participants' performance after the intervention."
Alternatives: "an additional indication" or "a subsequent sign".
Talk of a transfer from Werder Bremen was a further mark that he is making the transition into the life of a mainstream footballer.
Meanwhile Gritten's tribute for Philip French concluded with touching news of a further mark of respect, celebrating his regular attendance at the weekly national press screenings – from which he reviewed forthcoming cinema releases for the Observer.
The five, he said, could not provide any further useful information.There have been suggestions that the release of the Britons is a further mark of the special relationship between the United States and Britain.
As a further mark of respect, I implore the umpire and line judges to perform their duties in full military regalia – complete with tin helmet and Lee-Enfield bolt-action rifle.
As a further mark of favour, St Vincent antedated his commission to 22 April 1802, giving him greater seniority over the officers promoted a week later in the general promotion that followed the Peace of Amiens.
A further mark of success is that the comprehensive research networks have extended the model of national clinical research coordination to areas outside cancer, including diabetes, stroke and mental health.
The fast implementation of PCF (Algorithm 3) gives a further marked reduction in computing time.
The Libyan leader's first-ever trip to America, expected later in September for an address to the UN General Assembly, will mark a further sign of return from pariahdom.
It marks a further sign of the growing confidence of the UK movement, which sprang from an international wave of protests against the perceived excesses and inequalities of the global financial system.
The state news agency also referred to him as 'great leader' for the first time – a further sign that his accession marks continuity with the regime of his late father.
A further question mark hangs over just how affordable the project's "affordable housing" will be.
